Installing an Undersink Water Purifier

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These days everyone wants quality water but sometimes cost can be prohibitive. There are a number of filters available that can be mounted beneath your sink, and will give you bottled-water taste at a fraction of the cost.  Installation is straightforward and fairly simple.

First though you must choose a under-sink water-purifier kit (compression fittings and mounting hardware included) .  You will also need Teflon tape

Following are steps in the installation of a generic model. Read and follow the manufacturer’s directions and diagrams that come with your specific model. Installation should be fairly uniform for most models, but there may be model-specific variations. In our demonstration, the compression fittings supplied with the kit could be installed by hand–without the need for wrenches. An adjustable wrench may be useful for some installations.

Disconnect and remove the line that connects the cold-water supply to the faucet beneath the sink (figure A). In our demonstration, this simply involved loosening the securing nuts and removing the rigid supply line.
Place teflon tape on the fittings (figure B) to ensure a good seal with the new filter lines that you’ll be installing.
The filter apparatus is installed between the cold-water supply and the faucet, in the space where the rigid line was removed. The water-filter canister (figure C) is installed so that water enters the filter through an inlet, passes through the filter medium, and flows out through an outlet–resulting in filtered water being delivered to the faucet.
The canister body can be removed from the lid (figure D) so that the filter inside can be accessed and changed when necessary.
The water is forced through the filtering media (figure E) that’s housed inside the canister.

Flexible supply-lines (figure F) are included in the filter kit, and are used to connect the water supply to the filter inlet, and the filter outlet to the faucet. The flexible lines are easy to work with, and can be bent to conform to the space where the filter is being installed.

Compression fittings (figure G) are also included in the kit, and are used to connect the flexible supply-lines. The compression fitting are a reliable means of joining water lines together, and they consist of a compression nut, sleeve and ferrule.

Make the bottom connection by attaching one end of the first flexible line to the cold water supply. Seat the end of the plastic line down into the cold-water supply shut-off and hand-tighten the compression nut (figure H).

Important: Make certain that you are connecting the filter to the cold water supply line. The filter will not operate properly on the hot-water line.

Make the top connection by attaching one end of the second flex-line to the kitchen faucet. In our demonstration, an adapter (supplied with the kit) was required to make this particular connection (figure I).
Once the flex-line is attached to the faucet, attach the other end of that line to the out side of the filter (figure J).
With the first flex-line attached to the cold-water supply, attach the other end of that line to the in side of the filter (figure K).
With all of the water lines secured, the canister can be mounted on the back wall of the cabinet beneath the sink (figure L). Make certain that you route the flexible lines so that they are not bent or kinked in a way that might impede the flow of water.

Important: When installing an under sink filter, make sure that the canister is mounted in a position high enough that there is sufficient clearance beneath the canister (figure M) so that it can be unscrewed and removed when it’s time to change the filter. Check and follow the manufacturer’s instructions on the frequency for changing the filter.

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