How to Install Under Sink Water Filter -Easy Guide

Install this filter in your cold-water supply line under your kitchen sink. Install a separate faucet for filter water or connect the existing faucet.

You need these tools for installation:


  • Screwdriver
  • Basin wrench
  • Adjustable wrenches


  • Under-sink water filter kit
  • Teflon tape

Find out: Best Under Sink Water Filter

1. Disconnect the tubing

Under the sink, turn off the cold-water shutoff valve.

Remove the Tubing
Remove the Tubing (Image 1)

Loosen the nut and remove the tubing from the valve fitting to disconnect the water supply from the shutoff valve (Image 1). You need a basin wrench to loosen the nut holding the faucet stem tubing to the faucet (Image 2). You will need to remove the tubing.

Image 2
Image 2

2. Mark the Position

Mark Location
Mark Location

Your filter unit should be placed closest to the cold water supply line in the cabinet. Place the mounting bracket over your desired location and mark it with the holes. Drive the screws about halfway at the marks.

It is necessary to tighten the screws fully after the filter has been hung. Allow enough clearance between the filter and the canister so that the canister and the cartridges can be easily removed.

Check: 9 Best Reverse Osmosis Under Sink Water Filters

3. Make the Plumbing Connections

Make Connection
Make Connection (Image 1)

Once you’ve marked where the plumbing connections will be made, it is time to install them. You may want to use flexible stainless-steel supplies instead of the plastic tubes included in most sets when connecting the filter.

These flexible lines are threaded onto the brass fittings and have a variety of lengths. You can find them at most home centers, and they’re much more durable than plastic tubing.

Connect each brass fitting that is included in the kit to the filter cap. Use Teflon tape for a more reliable seal. Use an adjustable wrench to tighten the fittings, but do not overtighten (Image 1).

Image 2
Image 2

Connect one flex line to the fitting marked “in” and the other to the fitting marked “out” (Image 2).

Check our expert reviews about: Best under counter water filter

4. Hang the Filter

Connect The Flex Line
Connect The Flex Line

Fix the filter unit to the wall with mounting screws and tighten them until the unit is stable.

Attach the flex line between the inlet fitting and the shutoff valve.

5. Finalize all connections

Release Trapped Air And Check Leaks
Release Trapped Air And Check Leaks

The flexible line must connect to the threaded faucet stem from the “out” fitting.

Ensure that the plumbing connections are snug.

Turn the water supply back on slowly.

Press the pressure release button to release the trapped air. Make sure there are no leaks.

Note: Follow the manufacturer’s instructions and replace the cartridge at recommended intervals.

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