PENTAIR GRO-475B Reverse Osmosis Water Filtration System Instruction Manual

PENTAIR GRO-475B Reverse Osmosis Water Filtration System

Product Information

• Specifications
  • Model: GRO-475B / GRO-475M
  • Brand: FreshPoint
  • Type: Reverse Osmosis Water Filtration System
  • Pressure Range: [To be filled from the manual]
  • Temperature Range: [To be filled from the manual]
  • Total Dissolved Solids (TDS): [To be filled from the manual]

Product Usage Instructions

• Installation
  • Read the installation instructions provided in English on Pages 3-18 of the manual.
  • Ensure that your water supply meets the operating specifications mentioned in the manual to avoid warranty void.
  • Follow the step-by-step installation guide carefully to set up the reverse osmosis system properly.
• Operation
  • Once installed, turn on the reverse osmosis system using the provided controls.
  • Regularly monitor the system for any leaks or malfunctions.
  • Refer to the operation manual for detailed usage guidelines and maintenance instructions.

FAQs

• Q: What should I do if I notice a decrease in water pressure after installing the filtration system?
  • A: Check for any clogs in the filters or tubing. It is recommended to clean or replace the filters as needed.
• Q: How often should I change the filters in the system?
  • A: Refer to the maintenance schedule provided in the manual. Typically, filters should be changed every 6-12 months depending on water quality and usage.
• Q: Can this system remove all contaminants from the water?
  • A: The reverse osmosis system is designed to remove a wide range of contaminants, but it’s important to regularly test your water quality and replace filters accordingly for optimal performance.

IMPORTANT: Before installing this reverse osmosis system, make certain your water supply complies with the following operating specifications. Failure to do so may reduce the effectiveness of the system and will void the warranty.

SPECIFICATIONS

• Pressure Range: 40 to 100 psi (2.75–6.89 bar)
• Temperature Range: 40–100°F (4.4–37.8°C)
• TDS: <2000 ppm
• Maximum Hardness†: <10 gpg (170 mg/L)
• Sulfide, Iron and Manganese‡: <0.1 ppm
• Chlorine in Water Supply: <2 ppm
• pH Limits: 3–11
• Overall Dimensions: 14.57″W x 5.46″D x 12.54″H (370mm x 139mm x 319mm)
• Weight: 8.9 lbs (4.0 kg)
• Tank Dimensions: 10.91″DIA x 14.61″H (277mm DIA x 371mm)
• Tank Capacity Max: 3.2 gal (12.1 L)
• Tank Air Pressure Empty: 5-7 psi (0.34-0.48 bar)
• Tank Weight (Full): 25.50 lb (11.6 kg)

If the hardness of your water is above 10 gpg (171 mg/L), lime scale will build up rapidly on the membrane. Scale buildup will plug the membrane and make the system ineffective. We do not recommend these reverse osmosis systems to be used with water more than 10 gpg (171 mg/L) hardness. A maximum total level of approximately 0.01 ppm sulphide, iron or manganese is permissible. See your local dealer to reduce these substances in your water.

PARTS INCLUDED

• System with cartridges
• Storage Tank
• Installation Hardware Kit
• Lead-free drinking water faucet with air gap

Tools and Materials Required

• Hand or electric drill (cordless preferred)
• (2) Adjustable wrenches
• Slotted and Phillips screwdrivers
• File
• Safety glasses
• Drill bits: 1/8″, 3/16″, 1/4″, 3/8″
• Tube cutter or utility knife
• Pencil
• Towel
• Bucket
• Screwdriver bits: 1/8″, 3/16″, 1/4″, 3/8″

If the sink does not have a hole for a separate faucet:

• Center punch
• 3⁄4″ hole saw or drill bit
• Safety mask

NOTE: All tools may not be necessary for installation. Read installation procedures before starting to determine what tools are necessary.

PRECAUTIONS

GENERAL

WARNING: Do not use water that is microbiological unsafe or of unknown quality without adequate disinfection before or after the system. Systems certified for cyst reduction* may be used on disinfected waters that may contain filterable cysts. NSF/ANSI Standard 53 and 58 certified to reduce cysts such as Cryptosporidium and Giardia by mechanical means.
CAUTION: The RO System must be protected against freezing, which can cause cracking of the RO components and water leakage.

NOTE:

• Your water must be within the required limits for satisfactory operation. If not, your membrane life may be shortened and your warranty will be voided (see Specifications on page 3).
• This reverse osmosis system will not protect against disease-causing bacteria or remove naturally occurring harmless bacteria.
• Install on cold water line only.
• Make certain that installation complies with all state and local laws and regulations.
• The replacement cartridges and reverse osmosis element included with this system have limited service lives. Changes in taste, odour, and colour of the water being filtered indicate that the cartridge should be replaced.
• After prolonged periods of non-use (such as during a vacation), it is recommended that the system be flushed for 5 minutes before it is used.
• A drinking water cartridge may contain carbon fines (very fine black powder). After installation, flush the system for 5 minutes to remove the carbon fines before using the water.
• It is recommended that you run the tap at least 20 seconds before using water for drinking or cooking purposes.
• The contaminants or other substances removed or reduced by this water treatment device are not necessarily present in your water.

HOW REVERSE OSMOSIS WORKS

• The GRO-475B/GRO-475M Reverse Osmosis (RO) System uses a semi-permeable membrane to reduce dissolved salts and minerals, improving the taste and odour of your water.
• The RO membrane is made of layers of micron-thin film wound around a hollow centre core.
• Water molecules can pass through the membrane, but dissolved salts and minerals are rejected.
• The GRO-475B/GRO-475M Reverse Osmosis System features a 4-stage filter action. Your water supply is pre-filtered to reduce dirt and chlorine that may foul the membrane. The RO membrane separates this pre-filtered water into PRODUCT WATER and DRAIN or REJECT WATER.
• Incoming water pressure forces the product water through the membrane and into the storage tank. Dissolved solids and other contaminants cannot pass through the membrane and are sent to the drain as rejected water. When you open the drinking water faucet, product water is drawn from the storage tank through an activated carbon post-filter, providing you with cleaner, great-tasting water.
• For each gallon of water produced, several gallons are discharged as rejected water. The storage tank can hold up to 2.1 gallons (7.9 L) of water at a time, for drinking and cooking needs. When used under the Specifications on page 3 of the manual, your Reverse Osmosis membranes should last 12-24 months.

INSTALLATION

• Please read all instructions and precautions before installing and using your GRO-475B/GRO-475M.
• For standard, under-sink installation on 3/8″ (9.52 mm) steel, brass, or copper cold water line.
• When selecting a mounting location of the system and tank, take into consideration the length of tubing required for connections between existing plumbing and system components.
• Some installation sites may require more tubing than provided in the kit.
• Numbered diagrams correspond with numbered steps.

Installing the Water Supply Adapter

The supply adapter fits 1/2″-14 NPS supply threads or 3/8″ x 3/8″ compression. If local codes permit, it may be used to connect the system to the cold water supply line. If local codes do not permit the use of the supplied adapter, alternate connectors can be obtained from your local supplier.
Directions:

• (A) Turn off the cold water supply line. If the cold water line does not have a shut-off valve under the sink, you should install one.
• (B) Turn on the cold water faucet and allow all water to drain from the line.
• (C) Disconnect the riser cold water supply valve.
• (D) Ensure the sealing gasket is fully seated into the feed adapter valve female thread.
• (E) Install the feed adapter valve onto the supply valve as desired. The feed adapter valve may be installed at the bottom of the supply hose or the top of the cold water line. Hand tighten only.
• (F) Connect the riser to the feed adapter valve.

NOTE: Be careful not to cross-thread.

Selecting the Faucet Location

The drinking water faucet should be positioned with function, convenience, and appearance in mind. An adequate flat area is required to allow the faucet base to rest securely. The faucet fits through a 3/4″ hole. Most sinks have pre- drilled 1-3⁄8″ or 1-1⁄2″ diameter holes that may be used for faucet installation. If these pre-drilled holes cannot be used or are in an inconvenient location, it will be necessary to drill a 3/4″ hole in the sink to accommodate the faucet.

• CAUTION This procedure may generate dust which can cause severe irritation if inhaled or comes in contact with the eyes. The use of safety glasses and a safety mask for this procedure is recommended.
• CAUTION DO NOT ATTEMPT TO DRILL THROUGH AN ALL-PORCELAIN SINK. If you have an all-porcelain sink, mount the faucet in a pre-drilled sprayer hole or drill through the countertop next to the sink.
• CAUTION When drilling through a countertop, make sure the area below the drilled area is free of wiring and piping. Make certain that you have ample room to make the proper connections to the bottom of the faucet.
• CAUTION Do not drill through a countertop that is more than 1″ thick.
• CAUTION Do not attempt to drill through a tiled, marble, granite or similar countertop. Consult a plumber or the countertop manufacturer for advice or assistance.

The following instructions apply to stainless steel sinks ONLY.

• (A) Line the bottom of the sink with newspaper to prevent shavings, parts or tools from falling down the drain.
• (B) Place masking tape over the area to be drilled to help prevent scratches if drill bit slips.
• (C) Mark the point with a centre punch. Use a 1/4″ drill bit to drill a pilot hole through the sink.
• (D) Use a 1-1⁄4″ hole saw to enlarge the hole. Smooth rough edges with a file.

Mounting the Faucet WARNING: Due to variance in installation sites, it is highly recommended to install the 1/4″ red drain tubing to the RO system manifold before fully mounting the faucet. Make note of the 1/4″ red drain tubing length required to reach from the RO system manifold to the faucet connection and plan accordingly about mounting location of system components. Furthermore, the 1/4″ red drain tubing includes a flow controller installed at one end of the tubing. The end of the tubing with the flow restrictor must be securely installed into the RO system manifold before attaching it to the faucet. DO NOT cut off the flow restrictor.
NOTE: Not all parts provided with the faucet may be needed for installation.

• (A) Slide chrome plate and black rubber washer onto faucet by threading both drain tubes through the holes on the plate and washer.
• (B) Attach a large diameter red 3/8″ drain tube to the barb fitting at the faucet base. This tube should be long enough to reach the drain clamp in Step 4.
• (C) Locate the small diameter red 1/4″ drain tube connected to the drain port of the GRO element. Route the tubing to the faucet and cut off the excessive length of the tubing.
• (D) Slide the white extension spacer onto the long threaded section of the faucet. The open end of the extension should come in contact with the base of the faucet.
• (E) Screw washer, lock washer, and locking nut onto the end of faucet threads
• (F) Screw a quick connector onto the end of the faucet threads.
• (G) The wet end of the 3/8″ blue tube. Push into the bottom of the quick connector. Tug gently to be sure the connection is complete.
• NOTE: To remove the tube, push on the fittings’ collar and pull the tube out.
• (H) Holding the faucet, feed the three tubes through the hole in the sink. Position the faucet handle at the desired location
• (I) Center the faucet and slip the slotted disc between the white extension spacer and the bottom of the counter or sink. Tighten the locking nut with a wrench until it is tight.

Installing the Drain Clamp

• NOTE: If you have a single-basin sink with a disposal unit, call Technical Support for options.
• NOTE: Before installing the drain clamp, check the drainpipes under the sink for corrosion. Corroded pipes should be replaced before continuing with installation.
• (A) Attach the drain clamp to a vertical section of the drainpipe, about 6″ above the trap. Make sure the opening on the drain clamp is facing towards the drinking water faucet.
• (B) Using the fitting hole of the drain clamp as a guide, drill a 1/4″ hole through one side of the drainpipe.
• (C) Remove the drain clamp from the drainpipe and enlarge the hole with a 3/8″ drill bit. Use a file to remove rough edges from the drilled hole.
• (D) Make sure the black rubber gasket is adhered to the inside of the drain clamp and place the drain clamp assembly over the drilled hole. Look through the hole and position the clamp so that the centre of the clamp hole is slightly higher (about 1/16″) than the centre of the drilled hole. Tighten the clamp securely.
• (E) Screw the plastic compression nut onto the drain clamp until hand-tight.

Connecting the Faucet to the Drain

CAUTION This is a gravity drain line. Any loops, kinks or sharp bends must be eliminated before proceeding. Failure to create a straight line to the drain may result in reject water leaking through the air gap in the faucet onto the countertop and below the faucet.

• (A) Align the larger reject 3/8″ red tubing from the faucet with the compression nut on the drain clamp. Create as straight and smooth a path as possible with the tubing. Do not kink tube. Cut the tubing squarely and remove any internal and external burrs. Insert the inner tube insert (white cone) into the end of the 3/8″ red tubing. Remove the compression nut from the drain clamp. Place the compression nut on the end of the 3/8″ red tubing.
• (B) Insert the tubing into the drain port until it stops. Tighten the compression nut with your fingers, then tighten 1 to 2 turns with a wrench to secure the tubing to the drain port.

Mounting the System

WARNING: When selecting a mounting location for the system and tank, take into consideration the length of tubing required for connection between components. Some installation sites may require more tubing than provided in the kit.

• (A) Select a location under the sink or other suitable area where the system will be installed.
• NOTE: The system carton can be used to determine the operational footprint required for installation of the system and replacement cartridges. (Figure 6)
• (B) Mount the system vertically. Ensure mounting is level. Remove filter cartridges for easier access to bracket mounting holes. Place a pencil mark in the upper slots of the bracket mounting holes. (Figure 4b).
• Alternate mounting option: If mounting the system near the floor, place the pencil marks above each of the mounting holes on the bracket to ensure enough space resides below the cartridge and the floor for cartridge replacement (Figure 4c). Use the  3/32″ drill bit to create pilot holes for mounting.
• WARNING: The system should be mounted to a firm, solid surface that can support the weight of the system.

Connecting the Faucet to the System

• (A) Determine the length of plastic blue tubing needed to connect to the outlet (right) side of the filter from the faucet. Be sure to allow enough tubing to prevent kinking and cut the tubing squarely. Use a marker to mark one end of the tubing 5/8″ from the end. Wet the end of the 3/8″ tube and push into the outlet (right) connection of the system up to the mark.
• CAUTION Do not bend or crimp the tube while inserting.
• (B) Gently pull back on the tube to ensure it is connected properly.

Connecting the Storage Tank to the System

Connecting the Storage Tank to the System

CAUTION When the tank is full, it weighs approximately 19.50 lbs. (8.8 kg.) Provide ample support under the tank.

• (A) To prevent leaks, apply 3 or more wraps of plumber tape to threads on the tank. Thread the tank valve onto the top of the tank opening. Turn the tank so the handle is in line with the tubing.
• CAUTION The tank/valve connection will leak if not properly sealed. Plumber tape will normally seal the threaded connection.
• (B) Locate the 3/8″ blue tubing. Place a mark on the tubing 5/8″ from one end. Moisten the marked end of the tubing with water and insert with a twisting motion into the port of the tank valve until the 5/8″ mark is flush with the quick connect fitting. Then locate the tank near the system’s installation area.
• (C) Cut the tubing to the correct length. Install the free end of the tubing into the white quick-connect fitting on the system. Ensure the tubing does not kink. Retain the remaining blue tubing for use in connecting the system to the water supply adapter. Some installation sites may require additional tubing not provided in the kit.
• (D) Place the entire system over mounting screws on the wall and slide down.
• CAUTION Make certain the system is firmly attached to the wall to prevent it from falling and possibly becoming damaged.
• NOTE: Use caution not to bend or pinch the tubing behind the system while attaching to mounting screws.

Connecting the System to the Water Supply Adapter

• (A) Locate the remaining length of 3/8″ plastic blue tubing.
• (B) Place a mark on the tubing 5/8″ from the end. Moisten the end of the tubing with water and insert with a twisting motion push into the white quick connect fitting on the left side of the system. Depending on the installation, the system may need to be removed from the mounting surface to access the left side of the system. (C) Cut the tube to a length that will allow connection to the Water Supply Adapter. Ensure the tubing does not kink. Place a mark on the tubing 5/8″ from the end. Moisten the end of the tubing with water and insert with a twisting motion push into quick connect fitting on the Water Supply Adapter.

Faucet Operation

• (A) For controlled water flow, push the handle down.
• (B) For constant water flow, lift the faucet handle to lock it in the open position.

System Start-up

• NOTE: The reverse osmosis membrane is treated with a food grade sanitizing agent that may cause an undesirable taste. Although it is not harmful, it should be flushed from the system.
  NOTE: The post-polishing filter may contain fine black carbon particles. These fines are harmless but may make the water appear grey. The carbon fines are flushed from the system with the first tank full of water.
  NOTE: The RO system does not produce a high volume of water on demand as an ordinary filter does. Water is produced at a slow, drop-by-drop rate. The system requires about 2 to 4 hours to fill the storage tank. As water is taken from the tank, the system automatically starts the cycle of replacing the water and then stops water production when the tank is full.

• CAUTION Visually check the entire system for leaks. If a leak is present, see Troubleshooting on page 14.

• (A) Turn off the valve at the top of the storage tank.

• (B) Turn on the cold water supply slightly, and ensure the supply adapter valve is open.

• (C) Lift the faucet handle to lock it in the open position and let it drip for 30 min.

• (D) Completely open the cold water supply until it comes to a stop. Allow water to drip from the faucet for 12 more hours. Then close the faucet and open the valve on the storage tank. The tank valve is open when the handle lines up with the tubing connection.

• (E) Allow 3 hours for the tank to fill. Continue to periodically check the installation for leaks. After the storage tank is filled, open the faucet to flush the post-filter cartridge. Allow 4 to 5 minutes for all of the water to drain from the tank. Close the faucet and allow the tank to fill.

• (F) Repeat step E four times.

• NOTE: Initially, the water may appear cloudy. This is a result of air trapped in the post-polishing filter. It is not harmful and will disappear in a matter of minutes. It may take up to a week after installing a new post-polishing filter for the trapped air to dissipate. The system is ready for operation. You can now enjoy quality water from your Reverse Osmosis System.

(NON-MONITORED SYSTEMS ONLY) Model GRO-475B Reverse Osmosis System Total Dissolved Solids (TDS) Test

• NOTE: It is highly recommended that you (the consumer) have your water tested at least every 6 months to verify that your system is performing satisfactorily.

SAMPLING INSTRUCTIONS:

• Sampling instructions are included with the Total Dissolved Solids (TDS) Test Kit.

OPTIONAL INSTALLATION

Connecting your Reverse Osmosis System to a Refrigerator Icemaker / Water Dispenser

• CAUTION If you are connecting this unit to your refrigerator/icemaker with initial RO installation, wait to turn on the icemaker until the post-polishing filter has been flushed according to Step 11.
• CAUTION Use plastic tubing and fittings. Do not use copper tubing or brass fittings.
• NOTE: For optimum performance, it is recommended that the distance between the RO system and the refrigerator icemaker/water dispenser be no greater than 10 feet (3 m). At distances greater than 10 feet, the water pressure from the system may not be adequate to deliver water to the refrigerator.

MATERIALS REQUIRED(available from your local hardware store):

• 3/8″ x 3/8″ x 3/8″ (0.952 mm x 0.952 mm x 0.952 mm) compression or quick-connect tee
• 10 feet (3 m) of 3/8″ (0.952 mm) polyethylene tubing
• Shut-off valve

1. Turn off the refrigerator water supply and icemaker (consult manufacturer’s guidelines).
2. Close the tank valve (on top of the storage tank).
3. Turn off the water to RO system at the cold water supply, or the feed water supply adapter.
4. Open the drinking water faucet to relieve pressure.
5. Locate the tubing (permeate) leading to your drinking water faucet. Cut and insert the 3/8″ x 3/8″ x 3/8″ compression or quick-connect tee into the permeate tubing. Consult the manufacturer’s guidelines before installing the supply adapter.
   • NOTE: When cutting the permeate tubing, you may experience some water leakage.
6. Using a length of 3/8″ polyethylene tubing, connect the icemaker/dispenser line with the free port on the compression tee.
7. The shut-off valve should be installed as close to this port of the tee as possible. The Shut-off valve should be installed in the OFF position Consult the manufacturer’s guidelines before installing the shut-off valve.
8. Completely open cold water supply.
9. Open tank valve.
10. Turn off the drinking water faucet.
11. Turn on the water to the RO system at the cold water supply.
12. Turn on the ice maker and open the shut-off valve. Consult the manufacturer’s instructions.
13. Check for leaks and tighten connections if necessary.

Filter Cartridge Replacement

NOTE: The life of the filter cartridges depends on the water volume used and the quality of the feed water. It is recommended that the filter cartridges be replaced every 6-12 months, or when there is a noticeable change in taste, odor, or flow of filtered water.
Ensure the correct cartridge is purchased for the system.

• Model GRO-475B/GRO-475M uses FDF1-RC, GRO75-RC, F1B1-RC, and F1GC-RC Replacement Cartridges.

1. Cartridge Replacement
   • A. Relieve pressure by turning off the water supply to the system and opening a faucet until the water flow stops (wait 5 to 10 minutes after the water stops to relieve pressure in the RO membrane). Place a bucket or towel under the system to catch any water drips.
   • B. Lift the locking bar upward until the filter cartridge disengages from the filter head assembly (Figure A).
   • C. Pull the cartridge away from the filter head assembly and ensure the locking bar remains in the fully up position (Figure B).
   • D. Align the posts on the filter cartridge with the ports in the filter head assembly. Slide the cartridge filter into the filter head assembly (engaging with the locking bar causing it to drop forward and down). (Figure C).
   • E. Pull down the locking bar until it snaps into place (Figure D).

Cartridge Sequence

Troubleshooting

Leaks between filter head assembly and filter cartridge

1. Relieve pressure by turning off the water supply to the system and opening the faucet until the water flow stops. Place a bucket or towel under the system to catch any water drips.
2. Remove the cartridge and inspect the O-rings to make sure they are seated and clean.
3. Install filter cartridge. Place the system into operation and check for leaks. If leaks persist, turn off the water supply and contact Technical Support at 1-800-279-9404.

Leaks from tubing fittings

1. Relieve pressure by turning off the water supply to the system and opening the faucet until the water flow stops. Place a bucket or towel under the system to catch any water drips.
2. Depress the collet on the system or inlet supply adapter tubing fittings and pull the tubing from the fitting. Inspect the surface of the tubing for scratches or debris. Clean or cut back tubing to access clean surface.
3. Wet the end of the inlet tubing and press into the inlet fitting of the system. Ensure the tubing is fully pushed past the fitting O-rings.
4. Place the system into operation and check for leaks. If leaks persist, turn off the water supply and contact Technical Support at 1-800-279-9404.

Cartridge Timer Procedure

FILTER CARTRIDGE TIMER: (MONITORED SYSTEMS ONLY)

• The filter cartridge timer can be installed on the system’s decorative cover by peeling away the adhesive backing on the metal plate included with the cartridge timer.
• The timer can also be attached to a metal magnetic surface using the magnet that is factory-installed on the cartridge timer.

INSTALLATION AND ACTIVATION

• Once the installation location has been selected, activate the timer by pulling the plastic tab out from the side of the timer. Press and release the key to verify the battery is operational. The light will blink green three times. (Figure A)
• NOTE: The timer operates on a 12-month schedule. The timer uses a coin cell type 2023 battery.

The Filter Cartridge Timer is an Operational Operation

1. The timer will begin to blink red once every three minutes after 11 months and will blink red three times every three minutes after 12 months. (Figure B)
   • NOTE: The timer status of the cartridge life can also be viewed immediately by pressing and releasing the key.

Reset Timer

1. To reset the timer after filter cartridge replacement, press the key and hold for 5 seconds. The timer is now reset to 12 months. (Figure C)

Battery Replacement

1. Replace the battery every 12 months. To replace the battery, locate the slot on the side of the timer body and carefully remove the front of the timer. The battery is now accessible. (Figure D)
2. Slide the new battery under the battery retention bracket with the positive + side of the battery facing up towards the battery retention bracket. Align the tab on the timer back to the slot on the timer front and press and snap both timer halves together. Battery replacement will not reset the 12-month timer. If reset is required, press and hold the key for 5 seconds.

TDS MONITOR (MONITORED SYSTEMS ONLY)
The GR0-475M is equipped with a TDS monitor that checks the Total Dissolved Solids (TDS) the system is reducing from the water. The TDS Monitor allows the user to test the quality of the water produced by the system. Test the unit if a noticeable change occurs in the taste of the drinking water.
The TDS Monitor will display the following colours when pressing the test button:
Red Light (Left): Water Quality Test Required, proceed to the following steps

1. Draw 1 gallon of water from the unit to purge standing water from the TDS monitor probes.
2. Push the button to test again. If the light is still red, open the faucet and allow water to run until the storage tank is empty. Flow from the faucet will noticeably decrease indicating the storage tank is empty.
3. Close the faucet and allow the system to fill the storage tank, for 2-3 hours
4. Push the button to test. If the light is still red, replace the membrane cartridge.
   • Green Light (Right): System Operational
   • Red and Green Light: Verify inlet and outlet conductivity probes dry, no water to the system
   • No Lights: The battery needs to be changed. Replace the battery every 12 months.
   • NOTE: The TDS monitor is activated during initial installation by pulling the plastic tab out from the TDS monitor.

Replacing the Battery

1. Replace the battery every 12 months. To replace the battery, remove the TDS Monitor Cover and remove the battery from a retainer.
2. Slide the new battery under the battery retention bracket with the positive + side of the battery facing up towards the battery retention bracket.
3. Install the TDS Cover and press the button to verify operation.

TROUBLESHOOTING GUIDE Leaks on tank valve assembly

1. Open the drinking water faucet to drain the storage tank. Let the drinking water faucet run until it drips. Turn off the cold water supply.
2. Push in on the white collar of the tank valve fitting and pull out the tubing. Unscrew the tank valve from the storage tank. Rewrap threads on top of the tank with plumber tape. Screw the tank valve back onto the tank. Trim 1/2″ from the end of the tubing and reinsert 5/8″ into the tank valve fitting.
3. Open the cold water supply and shut off the reverse osmosis faucet. Let the system pressurize for several hours and check for leaks. Check again after the tank is fully pressurized.

Leaks on quick-connect fittings

1. Close the cold water supply and tank valve.
2. Depress the plastic collar and pull out the tubing.
3. Cut off 1″ of tubing and place a mark 5/8″ from the end of the tubing. Tubing should be cut squarely. The internal and external burrs should be removed.
4. Push tubing 5/8″ into fitting.
5. Open the cold water supply and tank valve. If leaks persist, call Technical Support.

High TDS in Product Water

• If high levels of TDS (Total Dissolved Solids) are detected in your product water as determined by the TDS Monitor or by the
• TDS test kit, the cartridge membrane may need to be replaced or the reject flow control may be clogged. See your dealer or plumber to check product water TDS.

Reduced production

• Slow or no product water flow usually indicates a clogged cartridge.

Gradual return of taste and odour

• The gradual return of unpleasant taste and odour over some time may indicate that your cartridges need to be replaced.

Sudden return of taste and odour

• If shortly after complete servicing noticeable taste and odours return, contact Technical Support.

No water pressure from the drinking water faucet or low volume in the storage tank

1. Close the cold water supply to the system.
2. Lift the storage tank to see if it is empty. If not, open the drinking water faucet to empty the water from the tank.
   • NOTE: It may be necessary to pump a small amount of air into the tank with a bicycle pump to remove all the water from the tank.
3. When the tank is empty, use a pressure gauge to check tank pressure. An empty tank should contain 5 to 7 psi pressure. Increase or decrease the air pressure in the tank accordingly.
4. Open cold water supply. Let the system run for 3 hours to fill the tank, then check the system performance. If performance has not improved, call Technical Support.

PERFORMANCE DATA

IMPORTANT:

• Read this performance data and compare the capabilities of this system with your actual water treatment needs.
• It is recommended that before installing a water treatment system, you have your water supply tested to determine your actual water treatment needs.
• This system has been tested according to NSF/ANSI 58 for the reduction of substances listed below.
• The concentration of the indicated substances in water entering the system was reduced to a concentration less than or equal to the permissible limit for water leaving the system as specified in NSF/ANSI 58. The GRO-475B/GRO-475M shall only be used for arsenic reduction on chlorinated water supplies containing detectable residual free chlorine at the system inlet.
• Water systems using an in-line chlorinator should provide a one-minute chlorine contact time before the RO system.
• WARNING: Do not use water that is microbiological unsafe or of unknown quality without adequate disinfection before or after the system. Systems certified for cyst reduction may be used on disinfected waters that may contain filterable cysts.
• NOTE: Substances reduced are not necessarily in your water. Filter must be maintained according to manufacturer’s instructions, including replacement of filter cartridges.
• The tested efficiency rating for these systems is 23.57%. Efficiency rating means the percentage of the influent water to the system that is available to the user as reverse osmosis treated water under operating conditions that approximate typical daily usage.
• The tested recovery rating is 41.05%. Recovery rating means the percentage of the influent water to the membrane portion of the system that is available to the user as reverse osmosis treated water when the system is operated without a storage tank or when the storage tank is bypassed.
• The GRO-475B/GRO-475M has been tested for the treatment of water containing pentavalent arsenic [also known as As(V), As(+5), or arsenate] at concentrations of 0.050 mg/L or less.
• This system reduces pentavalent arsenic, but may not remove other forms of arsenic. This system is to be used on water supplies containing a detectable free chlorine residual or on water supplies that have been demonstrated to contain only pentavalent arsenic. Treatment with chloramine (combined chlorine) is not sufficient to ensure complete conversion of trivalent arsenic to pentavalent arsenic. Please see the Arsenic Facts section of the Performance Data Sheet for further information.
  • EPA # 082989-CHN-001
  • System Production Rate: 21.08 gpd (79.77 Lpd)
  • Recovery Rating: 41.05%
  • Efficiency Rating: 23.57%
  • TDS Rejection: 96.3%

System Tested and Certified by NSF International against NSF/ANSI Standard 42, 53, 58, and CSA B483.1 for the reduction of the claims specified on the C US Performance Data Sheet.

GRO-475B/GRO-475M SYSTEM INSTALLED WITH FDF1-RC, GRO75-RC, F1B1-RC, F1GC-RC FILTER CARTRIDGES

Model GRO-475B / GRO-475M

Substance| Influent Challenge Concentration| Max Permissible Product Water Concentration| Reduction Requirements| Average Reduction
---|---|---|---|---
Standard 42
Chlorine

Taste and Order

| 2.0 mg/L ± 10%|  | ≥50%| 95.9%
Standard 53
Cysts| Minimum 50,000/L|  | 99.95%| 99.99%
Atrazine| 0.009 mg/L ± 10%| 0.003 mg/L|  | 93.7%
Lead (pH 6.5)| 0.15 mg/L ± 10%| 0.010 mg/L|  | 99.9%
Lead (pH 8.5)| 0.15 mg/L ± 10%| 0.010 mg/L|  | 99.6%
Lindane| 0.002 mg/L ± 10%| 0.0002 mg/L|  | 97.4%
Standard 58
Total Dissolved Solids| 750 ± 40 mg/L| 187 mg/L|  | 96.3%
Pentavalent Arsenic| 0.050 mg/L ± 10%| 0.010 mg/L|  | 88.0%
Fluoride| 8.0 mg/L ± 10%| 1.5 mg/L|  | 93.6%
Cysts| Minimum 50,000/mL|  | 99.95%| 99.99%
Turbidity| 11 mg/L ± 1 NTU| 0.5 NTU|  | >99.1%
Lead| 0.15 mg/L ± 10%| 0.010 mg/L|  | 98.6%
Selenium| 0.10 mg/L ± 10%| 0.05 mg/L|  | 97.9%
Copper| 3.0 mg/L ± 10%| 1.3 mg/L|  | 98.5%
Cadmium| 0.03 mg/L ± 10%| 0.005 mg/L|  | 99.1%
Hexavalent Chromium| 0.3 mg/L ± 10%| 0.1 mg/L|  | 96.4%
Trivalent Chromium| 0.3 mg/L ± 10%| 0.1 mg/L|  | 98.2%
Radium 226/228| 25 pCi/L ± 10%| 5 pCi/L|  | 80.0%
Barium| 10.0 mg/L ± 10%| 2.0 mg/L|  | 96.3%

NSF/ANSI Standard 53 and 58 certified to reduce cysts such as Cryptosporidium and Giardia by mechanical means.

Arsenic Fact Sheet

• Arsenic (abbreviated As) is found naturally in some well water.
• Arsenic in water has no colour, taste or odour. It must be measured by a lab test.
• Public water utilities must have their water tested for arsenic.
• You can get the results from your water utility. If you have your well, you can have the water tested.
• The local health department or state environmental health agency can provide a list of certified labs.
• There are two forms of arsenic: pentavalent arsenic [also called As(V), As(+5), and arsenate] and trivalent arsenic [also called As(III), As(+3) and arsenite].
• In well water, arsenic may be pentavalent, trivalent, or a combination of both. Special sampling procedures are needed for a lab to determine what type and how much of each type of arsenic is in the water.
• Check with the labs in your area to see if they can provide this type of service.
• Reverse osmosis (RO) water treatment systems do not remove trivalent arsenic from water very well.
• RO systems are very effective at removing pentavalent arsenic. A free chlorine residual will rapidly convert trivalent arsenic to pentavalent arsenic.
• Other water treatment chemicals such as ozone and potassium permanganate will also change trivalent arsenic to pentavalent arsenic.
• A combined chlorine residual (also called chloramine) may not convert all the trivalent arsenic.
• If you get your water from a public water utility, contact the utility to find out if free chlorine or combined chlorine is used in the water system.
• The GRO-475B/GRO-475M system is designed to remove pentavalent arsenic.
• It will not convert trivalent arsenic to pentavalent arsenic. The system was tested in a lab.
• Under those conditions, the system reduced 0.050 mg/L (ppm) pentavalent arsenic to 0.010 mg/L (ppm)(the USEPA standard for drinking water) or less.
• The performance of the system may be different at your installation. Have the treated water tested for arsenic to check if the system is working properly?
• The RO component of the GRO-475B/GRO-475M system must be replaced every 12-24 months to ensure the system will continue to remove pentavalent arsenic.
• The component identification and locations where you can purchase the component are listed in the installation/operation manual.
• ©2023 Pentair Residential Filtration, LLC pentair.com.

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