How to Install a Reverse Osmosis Water Filter | Ask This Old House

Ask This Old House plumbing and heating expert Richard Trethewey installs an under sink water filter that can remove most contaminants
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Time: 1 hour

Cost: $100

Skill Level: Moderate

Tools List for Installing a Reverse Osmosis Water Filter:
Adjustable Open Ended Wrench

Shopping List:
Reverse Osmosis Filter
3⁄8” x 3⁄8” x 1⁄4” compression T fitting

1. Before doing any plumbing work, turn off the water supply at the water main.
2. Mount the filters to the inside of the kitchen cabinet.
3. Remove the hand soap dispenser or side sprayer to allow for a hole for mounting the new faucet.
4. Pass the tubes through the mounting hole and connect them to the faucet base.
5. Mount the faucet base to the sink or counter using the supplied toggle bolt and a screwdriver.
6. Connect the water line to the faucet and attach the faucet to the faucet base.
7. Add the compression T fitting to the existing cold water supply to allow connection to the new water filter. Use a wrench to tighten the connections.
8. Install the drain adapter to the existing drain piping and connect the drain tubing to the new drain adapter. You may need to modify the existing drain piping.
9. Connect the final piece of tubing to the pressure tank and tuck the tank under the sink.
10. Turn back on the water supply.

Richard installed the Twist and Lock Reverse Osmosis Filtration System, which is manufactured by GE Appliances ( available at home centers.

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Homeowners have a virtual truckload of questions for us on smaller projects, and we’re ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O’Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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How to Install a Reverse Osmosis Water Filter | Ask This Old House

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