How to Install Water Filter


Millions of households have switched to bottled drinking water because of concerns over the purity or taste of their tap water. Such problems exist across the country, including Flint, MI now experiencing lead contaminated drinking water. There is an easy less expensive way to obtain clean drinking water: install an under-the-sink water filtration system or a whole-house water filter. 

Materials & Tools:

  • Bucket
  • Adjustable Wrenches
  • Power Drill
  • Pipe Cutter
  • Pliers
  • Filtration Kit
  • Teflon Tape

Under-the-Sink Filtration


1. Turn Off the Water Supply. 

Typically located in the basement of your home. Hold a bucket under the valve and loosen the drain cap.

2. Cut into the water-supply line.

Locate the cold water valve under the sink. Buff clean the copper tubing directly below the valve. Use a tubing cutter to remove a 1 inch long section of tubing and slip a 1/2 inch copper tee fitting onto the tubing below the valve.

Be sure to protect the cabinet with a fire-resistant cloth or metal shield.

3. Solder a new shut-off valve.

Solder the assembly together before installing for maximum safety. First solder the copper tubing to the ball valve, then to the tubing, and finally the tubing to the female adapter. Fit the assembly onto the tee fitting off the cold water supply with a 90 degree elbow. Solder both ends.

Wrap Teflon tape around the reducer fitting and thread it onto the top of the female adapter, hold them together with pliers while tightening the reducer with a wrench.

4. Drill a hole for the new filter faucet. 

For a cast iron sink, locate the hole on the counter top or mount the filter’s faucet in the sprayer hole. Drill a 1/2 inch diameter hole through the stainless steel with a step drill. Cover the location with a strip of masking tape or strike a point in the center punch to keep the drill from “walking.”

5. Install the filter faucet. 

After drilling a hole, use a wet/dry vacuum to collect metal chips from the sink and inside the cabinet. Place the washer, aluminum base, and rubber gasket onto the threaded stem of the water filter faucet.

From inside the cabinet, reach up and place the mounting bracket, lock washer, and hex nut on the faucet’s stem. Carefully tighten the hex nut to secure the faucet.

6. Attach the plastic tubing to the filter. 

Remove the plastic cover from the top of the filter and install the 9V battery which powers the motor. Next, cut a length of the plastic tubing to reach from the reducer fitting on the cold water supply to the filter’s mounting location on the back wall of the cabinet. Push one end of the tubing onto the inlet fitting on the left side of the filter.

Cut another length of tubing long enough to extend from the outlet  fitting on the right side of the filter up to the faucet system.

7. Mount the Filter in the Cabinet

Select a spot on the back wall inside the sink cabinet to mount the filter – mark two screw holes spaced to match the keyhole slots on the filter.

Drive a screw into each hole about 1/2 inch from the cabinets surface, align slots with mounting screws, and push the filter against the cabinet wall. Pull down to lock the keyhole slots onto the screw heads.

8. Connect the filter’s water supply tubing. 

Attach a compression fitting onto the end of the plastic tubing that’s connected to the inlet side of the filter. Thread the compression fitting onto the reducer that’s attached to the cold water supply line; tighten the fitting while holding the reducer with pliers.

Connect the other length of tubing to the outlet side of the filter and to the faucet system using a compression fitting. Open all shutoff valves and check for leaks. Remove the aerator from the sink’s faucet and turn on  the cold water faucet for a couple minutes to flush out any flux.

Open the filter faucet and let it run for five minutes to remove air and carbon particles from the cartridges.


Whole-House Water Filter


1. Chose a location. 

It is important to select a location that is convenient and accessible to change out filters. It may help to choose a site that is next to an existing shut off valve.

2. Turn off the main water supply. 

From the lowest point in the home, open a faucet to release pressure and drain most of the water from the system.

3. Cut pipe and install new shutoff valve. 

Cut into the water supply line near a shut off valve – follow the manufacturer’s instructions to ensure you cut away enough pipe to accommodate the filter, the new shutoff valve, and any connecting fittings.

Install a shutoff valve on the house side of the supply line – if you are sweating the valve, remove the insides of the valve before applying heat.

4. Attach the fittings. 

Place a compression nut end first on one of the cut pipe ends. Slide on the ferrule. Repeat on the other side.

Thread a brass fitting onto the “in” and “out” parts of the filter housing. Install them according to the manufacturer’s recommendations. Use Teflon tape to ensure a good seal between the fitting and the filter port. Tighten the fittings onto the filter until they’re tight enough.

5. Position the filter.

Install the filter so the flow of water enters the “in” port and exists through the “out” port. The filter will not function properly if installed backward. Position the filter on the water line, and let it hand temporarily between the two ferrules.

Hand tighten the compression nuts onto the fitting bodies. Keeping the filter straight and upright, tighten the fittings using a wrench.

6. Turn on the water.

The filter kit includes a special handle used to turn the inlet valve on top to various positions – “off,” bypass,” and “filter.” With the filter properly installed, turn on the valve to the “off” position. Slowly turn the water back on at the main shutoff valve. Check for leaks.

Use the handle to turn the valve from “off” to “filter.” The tank should fill with water and the unit will begin filtering. Check again for leaks, tighten fittings if necessary.

NOTE: Some houses use the water pipes as a ground for the electrical system. If so, you must install a jumper wire at the filter so the electrical ground is not interrupted by the placement of the filter.

7. Change the filter as needed. 

You will need to change the cartridge on a regular basis. The handle used to turn the inlet valve doubles as a tool to remove the filter tank when it is time to change filters.

Turn the valve handle to the “off” position. Use the handle to loosen and remove the tank from the housing. Have a bucket handy to catch any water. Wipe the inside of the tank with a clean cloth and insert a new cartridge. Return the valve to the “filter” position.


You can purchase water filters from our website at: 1st Source Servall Water Filters



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