Things You'll Need
Metal sink cap
Under-sink water filters attach to the water supply and remove contaminates and minerals from drinking water. They have a separate faucet that sits on top of the sink next to the sprayer. While under-sink filters have many advantages, there may come a time when you must remove it. Removing an under-sink filter can be done by most homeowners with only a few basic tools.
Remove the Water Filter
Open the cabinets under the sink and locate the cold water pipe that extends down from the cold water knob on the faucet.
Locate the oval-shaped, silver water shutoff knob on the cold water pipe and turn it to the left until it will no longer turn to shut off the water supply. In some homes, there is a lever that shifts to the side of the pipe instead of a knob.
Turn the cold water faucet on to allow any trapped water to run out of the pipe. This prevents it from leaking on the floor when you disconnect the pipe.
Locate the small, flexible tubing that extends from the water filter to the cold water pipe. Place a wrench on the metal nut located above the connection and turn it counterclockwise to loosen it. Repeat the process to loosen the metal nut under the connection as well.
Lift the metal "T" fitting off of the cold water supply and set it aside. The hose for the water filter will still be attached to it. Remove the hose from the fitting, if desired, by unscrewing the nut at the base of the hose.
Pull the top and bottom of the water pipes together to close the gap where the water filer connection was installed. Tighten the nut by turning it clockwise to connect them back together.
Place the wrench around the nut and turn it an additional one to two times until it is tight.
Look at where the actual filter is mounted to the cabinet and locate the screws holding it in place. Remove the screws with a screwdriver to detach the filter from the cabinet.
Turn the water supply back on to the faucet.
Remove the Water Filter Faucet
Look under the sink where the water filter faucet is still attached and locate the metal nut. Tun the nut counterclockwise with the wrench to remove it.
Grasp the top of the water filter faucet and pull it up through the top of the sink until the hose end comes out.
Place a metal cap, available at any hardware store, into the hole on top of the sink and tap it in with a hammer.