Installation: Watts PWROKC4 Kwik-Change Reverse Osmosis System User Manual

Overview

The PWROKC4 Kwik-Change Reverse Osmosis System is a four-stage under-sink water filtration system designed to produce treated drinking water from a cold-water supply. It combines sediment filtration, carbon filtration, reverse osmosis, and final activated-carbon polishing with a storage tank and dedicated air-gap faucet.

This system is intended for households that want point-of-use reduction of dissolved solids, sediment, chlorine-related tastes, odors, and several dissolved contaminants. The system can produce up to 60 gallons of treated water per day under suitable operating conditions, although actual production depends on water pressure, temperature, water quality, and usage.

Specifications

• Model: PWROKC4
• System type: Four-stage reverse osmosis filtration system
• Maximum production: Up to 60 gallons per day
• Storage tank: Three-gallon tank
• Operating water temperature: 40°F to 100°F (4°C to 38°C)
• Operating pressure: 40 to 85 psi (2.80 to 6.0 kg/cm²)
• pH range: 2 to 11
• Maximum iron: 0.2 ppm
• Maximum total dissolved solids: Less than 1800 ppm
• Maximum turbidity: Less than 5 NTU
• Recommended hardness: No more than 10 grains per gallon or 170 ppm
• Water connection: Cold-water supply only
• Faucet connection: Dedicated chrome air-gap faucet with top-mount installation
• Drain connection: Drain saddle for standard 1¼-inch to 1½-inch drain pipes
• Tubing: Green feed-water tubing, red brine tubing, blue product-water tubing, and black drain tubing
• Certification information: The system is tested and certified by WQA against NSF/ANSI Standard 372 for lead-free materials.

How the System Works

The PWROKC4 Kwik-Change Reverse Osmosis System uses pressure to move water through a semipermeable membrane. The membrane allows treated water to pass while concentrating rejected dissolved substances in a separate waste stream that flows to the drain.

The four treatment stages work in sequence:

• Stage 1: Sediment filter. A five-micron filter captures particulate matter such as dirt, silt, rust, and other sediment that can affect water appearance and taste.
• Stage 2: Carbon block filter. A five-micron carbon filter helps reduce chlorine and substances associated with unpleasant taste and odor.
• Stage 3: Reverse osmosis membrane. The membrane is the primary dissolved-contaminant reduction stage. It helps reduce total dissolved solids, sodium, and heavy metals such as arsenic and copper.
• Stage 4: Granular activated carbon filter. This post-filter polishes water after it leaves the storage tank before the water reaches the faucet.

Because reverse osmosis produces water gradually, the system stores treated water in its tank for on-demand use. During operation, some water is discharged through the drain as part of the membrane-rinsing and separation process.

Parts and Included Components

The package includes the RO module, storage tank, parts bag, faucet bag, and installation manual. The main system components are the following:

• Adapt-A-Valve for connection to the cold-water angle stop
• Automatic shut-off valve
• Sediment filter
• Pre-carbon filter
• Reverse osmosis membrane
• Post-carbon filter
• Three-gallon storage tank
• Tank shut-off valve
• Flow restrictor
• Chrome air-gap faucet
• Drain saddle and drain tubing
• Quick-connect unions and color-coded tubing

The filter heads include valves that stop water flow when a cartridge is released. This design allows cartridge replacement without separately closing the incoming supply at the Adapt-A-Valve, although the faucet must remain closed during filter changes.

Safety

• Read the complete installation and maintenance instructions before beginning work, and retain them for future reference.
• Use the system only with a cold-water supply. Hot water can seriously damage the filtration components.
• Do not use the system with microbiologically unsafe or unknown water unless suitable disinfection is performed before or after treatment.
• Install the unit on a clean, level, stable surface strong enough to support the system and its connections.
• Handle the module, tank, cartridges, and fittings carefully. Do not drop, drag, or invert them.
• Discard small installation parts that remain after assembly so they cannot become a hazard.
• Follow applicable plumbing regulations when installing the faucet, drain saddle, and water connections.
• Do not route treated RO water through copper tubing. The low-mineral water can draw copper from the tubing, causing taste problems or pinhole leaks.
• Test the treated water periodically to confirm that the system continues to perform satisfactorily.
• If incoming pressure exceeds 85 psi, use a pressure regulator. A regulator is required when pressure exceeds 100 psi.

Installation Preparation

Before installation, confirm that the package contains the RO module, tank, faucet components, parts bag, and manual. Inspect every component for shipping damage and choose an under-sink location that leaves enough room for cartridge replacement and tubing inspection.

Recommended tools include an adjustable wrench, Phillips screwdriver, pliers, sharp knife, electric drill, small drill bits, open-end wrenches, a 1¼-inch hole saw, and a 1¼-inch punch for stainless-steel sinks.

Water hardness above 10 grains per gallon may shorten membrane life. A softener can help extend membrane service life where hardness is high. Incoming water pressure should be evaluated over a full day when possible, because pressure variations affect production.

Faucet Installation

Porcelain Sink

Use extreme care when drilling porcelain because it can crack or chip. Mark the faucet location with masking tape, then drill a ⅛-inch pilot hole at the center using the slowest practical drill speed. Use lubricating oil or liquid soap to keep the bit cool. Enlarge the opening with a 1¼-inch hole saw, again using slow speed and cooling lubricant. Remove sharp edges and allow the sink area to cool before installing the faucet.

Stainless-Steel Sink

Center the opening between the backsplash and the sink edge, preferably on the same side as the vertical drain pipe. Drill a ¼-inch pilot hole, then use a suitable punch to enlarge the opening to 1¼ inches. Protect the sink surface and keep the punch aligned while enlarging the hole.

Top-Mount Faucet

Feed the faucet tubing and toggle bolt through the mounting opening from above the sink. Position the rubber gasket evenly between the faucet base and sink surface. Align the handle on the right, turn the handle toward you to expose the tightening screw, and secure the base without exceeding 5 lb-in of toggle-bolt torque. Insert the spout fully into the base, then turn the handle away from you to place the faucet in the off position.

Quick-Connect Tubing

Quick-connect fittings seal and grip the tubing when it is pushed fully into the fitting. Cut each tube squarely and remove burrs, scratches, and sharp edges. Mark the tube approximately ½ inch from its end as an insertion guide, then push the tube through the collet until it reaches the internal tube stop. Pull gently on the tube to confirm that it is locked.

To disconnect a tube, first depressurize the system. Press the collet straight toward the fitting body while pulling the tube out. The fitting can be reused after the tube is removed.

Water and Drain Connections

Adapt-A-Valve

Close the cold-water angle stop and open the cold-water faucet to release pressure. Select the Adapt-A-Valve configuration that matches the plumbing arrangement. Use the supplied washer where required, and do not apply PTFE tape to the Adapt-A-Valve connection.

Feed-Water Tube

Connect the green ¼-inch tube from the RO module to the open ¼-inch fitting on the Adapt-A-Valve. Leave enough length to prevent kinks, then cut the tube squarely before inserting it fully into the fitting.

Drain Saddle

Install the drain saddle on a standard 1¼-inch to 1½-inch drain pipe at least 1½ inches above the P-trap elbow or the garbage-disposal crossbar. Do not place it near a garbage-disposal connection where debris could obstruct the drain line.

Attach the foam gasket to the inside of the saddle, drill through only one side of the drain pipe with a ¼-inch bit, and align the saddle opening with the drilled hole. Tighten both sides evenly without overtightening, since excessive force can crack the saddle.

Route the ⅜-inch black drain tube as short, straight, and downward-sloping as possible. Insert it into the saddle, hand-tighten the compression nut, and then add approximately one-quarter turn with a wrench. Bends, dips, or excessive tubing can restrict gravity drainage and cause water to emerge from the faucet air-gap opening.

RO Module Mounting

Choose a position that allows access to all cartridges. Mount the module with the supplied self-tapping screws approximately 6 inches apart and about 16 inches above the cabinet bottom. Do not cut the system tubing until the module location has been established.

Tank Connection

Wrap the tank nipple with four to eight layers of the supplied PTFE tape. Install the tank ball-valve elbow without overtightening. Position the tank upright or on its side using the supplied stand, then connect the blue tube labeled for the tank. Push the tube fully into the tank valve fitting.

Faucet Connection

Join the ¼-inch blue tube labeled for the faucet to the ¼-inch side of the supplied ¼-inch-by-⅜-inch union. Insert the faucet’s ⅜-inch blue tube into the remaining side of the union. Confirm that both tubes reach their stops and that neither tube is kinked.

Startup and Operation

1. Open the cold-water angle stop and turn the Adapt-A-Valve counterclockwise to start the feed-water supply.
2. Inspect every connection for leaks and correct any seepage. Continue checking the installation periodically during the first 24 hours.
3. Open the RO faucet and leave it open until water begins to trickle from the spout.
4. Close the faucet and allow the storage tank to fill. Initial filling commonly takes approximately four to six hours, depending on membrane production, water temperature, and pressure.
5. When the tank is full, open the RO faucet and drain the tank completely until the flow slows to a trickle.
6. Repeat the complete tank flush two additional times. The fourth tank of water may be used for drinking.

During filling, a trickling sound is normal because the reverse osmosis process sends concentrate water to the drain. If the system supplies a refrigerator or ice maker, keep the ice maker turned off until startup flushing is complete and the tank has filled fully. An inline valve should be installed before the ice maker connection so that it can be isolated during startup and maintenance.

Tank Air Pressure

Check the storage tank only when it is completely empty of water. Close the Adapt-A-Valve, open the RO faucet, and allow the tank to drain. When the flow becomes a trickle, continue purging until the tank is empty.

Measure pressure at the Schrader valve behind the blue cap on the lower side of the tank. The empty-tank pressure should be between 5 and 7 psi. A digital pressure gauge provides the most consistent reading. Add or release air as needed, then restore the water supply and follow the startup procedure.

Cleaning and Maintenance

Six-Month Filter Service

Replace the sediment and pre-carbon cartridges approximately every six months. Actual cartridge life can vary with water quality and usage.

1. Place a towel beneath the RO module to catch residual water.
2. Keep the faucet closed. The filter heads will shut off water flow when a cartridge is released.
3. Lift the cartridge and head assembly upward as needed to improve access.
4. Starting with the sediment cartridge, rotate it one-quarter turn counterclockwise and remove it.
5. Remove the protective cap from the replacement cartridge.
6. Insert the replacement cartridge, rotate it one-quarter turn clockwise until it stops, and return it to the vertical position.
7. Repeat the process for the second cartridge.
8. Flush the storage tank once after replacement to remove normal carbon fines, then check for leaks during the following 24 hours.

Annual Filter Service

Replace the sediment filter, carbon block filter, RO membrane, and GAC final filter approximately once per year unless local conditions require more frequent service. Use replacement components with specifications intended for this system.

1. Place a towel below the module and ensure the faucet is closed.
2. Release each cartridge with a one-quarter counterclockwise turn.
3. Install each new cartridge with a one-quarter clockwise turn until it stops.
4. Return every cartridge to its normal vertical position.
5. Flush the tank completely once to remove natural carbon fines.
6. Inspect all connections over the next 24 hours.

Membrane Replacement

The membrane generally lasts two to five years, but service life depends on incoming water conditions and system use. Replace it sooner if water production decreases, taste changes, or testing shows that total dissolved-solids reduction has fallen below 75 percent.

Replace the membrane using the same quarter-turn cartridge procedure used for the other filter elements. Use a membrane with identical specifications to maintain expected reduction and efficiency. Flush the tank three complete times after membrane replacement before using the water for drinking.

Troubleshooting

Low or Slow Water Production

• Confirm that incoming pressure is at least 40 psi.
• Verify that the water supply is open and the Adapt-A-Valve is fully open.
• Inspect the tubing for kinks and straighten or replace restricted sections.
• Replace clogged sediment and carbon pre-filters.
• If the membrane is fouled, replace the membrane and flow restrictor.

Milky-Looking Water

Air trapped in a new system can make the water appear cloudy or milky. This normally clears during regular use within one to two weeks. If the appearance returns after a filter change, drain the storage tank one or two times.

System Runs Continuously

• Check for low incoming pressure, restricted tubing, or an incompletely opened Adapt-A-Valve.
• Confirm that incoming pressure does not exceed the system limit.
• Check storage-tank pressure with the tank empty and adjust it to 5–7 psi.
• Inspect the system for leaks or a malfunctioning shut-off condition.

Noise or Water at the Faucet Air Gap

• Inspect the drain tube for kinks, dips, restrictions, or excessive length.
• Make sure the drain tube slopes downward toward the saddle.
• Check for a clogged drain line, particularly when a dishwasher or garbage disposal shares the drain.
• If necessary, disconnect the black drain tube at the saddle and clear the blockage mechanically before reconnecting it.

Small Amount of Water in the Tank

• Allow four to six hours for normal initial filling.
• Remember that low pressure or low water temperature can significantly reduce production.
• Check empty-tank air pressure and adjust it to 5–7 psi.

Leaks at a Filter Housing

Confirm that the cartridge or housing is fully seated. If the leak continues, close the water supply and release pressure. Inspect the O-ring for twisting or damage, replace it if necessary, lubricate it appropriately, and seat it correctly before reinstalling the housing.

Low Faucet Flow

Check the empty-tank air pressure with a reliable gauge. The correct range is 5–7 psi. Also inspect the faucet tubing, post-filter, and drain path for restrictions.

Pros and Cons

• Pros: Four treatment stages, dedicated storage tank, automatic shut-off filter heads, quarter-turn cartridge replacement, color-coded tubing, air-gap faucet, and production capacity of up to 60 gallons per day.
• Cons: Installation requires drilling or adapting a sink, a drain connection, periodic cartridge replacement, storage-tank flushing, and sufficient incoming water pressure.

Warranty

Warranty coverage depends on the applicable limited warranty for the specific Watts Pure Water product. Some products may have limited coverage, while others may be covered only by an original manufacturer warranty or may have no Watts warranty. Warranty remedies are limited to those stated in the applicable warranty, and other express or implied warranties may be excluded where permitted by law.