An under-sink water filter fits under your kitchen sink, connected to the faucet to filter water. This filtering system is excellent for people whose water supply has harmful or unwanted elements, such as bacteria and microscopic organisms. If you do not know how to install a water filter under your sink, here is a step-by-step guide to install an under sink water filter.
Tools and Materials Needed
- Sharp knife
- Teflon tape
- Hole punch or plastic tubing cutters
- Wrenches (adjustable)
- Under-sink water filter
STEP 1: Turn off the Cold Water Valve
Open your kitchen sink cabinet and find the drainpipe with 2 incoming water lines. The filter is meant to be installed for the cold water line, so you need to turn off the water at the cold-water shut-off valve.
STEP 2: Remove Tubing
Separate the water line from the shutdown valve by tightening the nut and removing the tubing from the valve fitting. Using a basin wrench, remove the nut on the faucet stem. Remove the tubing from the water line system.
STEP 3: Mark the Location
Place your filter unit on the cabinet wall. Make sure it is close enough to the cold water line, but leave enough space below the filter so you’ll be able to take out the canister and change cartridges conveniently.
Use a marker or a pencil to mark the point where the holes are on the mounting bracket. Use your screwdriver or drill to drive a couple of screws nearly halfway at the points you have marked.
STEP 4: Make the Plumbing Connections
Now that you have the location marked, it is time to make the plumbing connection and enjoy the good quality water from your filter. Your plastic tubing cutters will come in handy. However, instead of the plastic tubing provided in most kits, consider using flexible stainless-steel supply lines or “flex lines.” These are often much more stable and durable when threaded onto brass fittings, and they come in different lengths.
Pass the brass fittings through each side of the filter cap. To make things more secure, use your Teflon tape to seal it off. Use an adjustable wrench to tighten the fittings enough to make sure it’s snug but not over-tightened.
Recall that one of the fittings is for inflowing water and the other fitting is for outflowing water, so you must connect the cold water feed to the adapter on the filter head. The tubing coming from the faucet should be connected to the adapter outside.
STEP 5: Hang Your Filter
Make sure your filter unit is properly assembled and hang it on the wall. Use mounting screws to tighten the unit and make sure it is secure. Connect the “in” fitting to the shutdown valve with the flex line.
STEP 6: Make the Final Connections
Connect the “out” fitting to the threaded faucet stem with the flex line. Confirm that the plumbing connections are snug and secure.
Slowly turn the water back on by opening the shut-off valve of the filter system. Note that it is crucial to do this slowly, so the sudden high water pressure does not damage the filter.
STEP 7: Release Trapped Air and Check for Leaks
Press the pressure release button to let any air trapped within the unit. Inspect all the plumbing connections to see if there is any water leakage or dripping. Address any that you find.
STEP 8: Let the System Flush
Keep the cold water faucet running for a couple of minutes to flush your new filter cartridges. This ensures that there are no contaminating elements from the line.