How to Install a Whole-House Sediment Water Filter

First, select a suitable location for the filter system. It should be on the main water line just after the main shutoff valve and water meter, but before the water heater. Ensure there is enough vertical and horizontal space to comfortably work and to allow for future filter changes (you'll need at least 6 inches of clearance below the filter housing to unscrew the sump). Gather all your tools and materials. Unpack the whole-house filter kit and lay out all the parts, including the filter housing, mounting bracket, and any included hardware. Perform a 'dry fit' by holding the assembly in the proposed location to visualize the final installation and confirm measurements.

Locate the main shutoff valve for your house. It is typically found where the water service pipe enters your home, often in the basement or a utility closet near the water meter. Turn the valve clockwise until it is fully closed. To drain the remaining water from the pipes, go to the lowest faucet in your house (like a basement utility sink) and the highest faucet (like an upstairs bathroom) and open them both. This will allow air to enter the system and help the water drain out completely. Place a bucket under the section of pipe where you will be working to catch any residual water.

Measure the total width of your assembled filter unit, including the threaded fittings you will use to connect it to the pipe. Transfer this measurement to the main water pipe and mark two cut lines with a marker. Double-check your measurement before cutting. Position the tubing cutter on the first mark, tighten it slightly, and rotate it around the pipe. Tighten the cutter knob after each rotation until the pipe is cut cleanly. Repeat for the second mark. After cutting, use a deburring tool to smooth the inside and outside edges of the cut pipe. This is critical for ensuring a watertight seal with compression fittings.

It's best to assemble the filter and bypass loop before installing it. First, wrap the threads of the male pipe nipples with 3-4 layers of Teflon tape in a clockwise direction. Screw one nipple into the 'IN' port and one into the 'OUT' port of the filter housing, tightening them securely with a wrench. Attach the filter housing to its mounting bracket using the provided screws. Mount the bracket to a secure surface like a wall stud or floor joist. Now, build the bypass. This will consist of two tee fittings and three ball valves. Using short pieces of 3/4-inch copper pipe and compression fittings, connect the tees to the main line connections and then build a parallel line above or around the filter with the third ball valve in the middle. This allows you to shut off water to the filter and route it through the bypass for maintenance.

With the filter and bypass assembly built, it's time to connect it to the main water line. Loosen the compression nuts on the assembly's connection points. Slide a compression nut and then a ferrule (compression ring) onto each of the cut ends of the main house pipe. Insert the ends of the pipe fully into the tee fittings on your assembly. The pipe must bottom out in the fitting socket. Slide the ferrules and nuts up to the fitting body. Hand-tighten the nuts first, then use two wrenches—one to hold the fitting steady and one to tighten the compression nut an additional half to three-quarters of a turn. The goal is to compress the ferrule onto the pipe, creating a watertight seal.

This is the most critical step. First, ensure the filter cartridge is NOT yet in the housing. Close the two ball valves leading to the filter and open the ball valve on the bypass loop. Make sure all faucets in the house are still closed. Go to the main shutoff valve and turn it on very slowly, allowing the pipes to fill with water gradually. Listen for the sound of rushing water to stop. Go back to the filter assembly and meticulously inspect every single joint and fitting for drips. Use a flashlight and a dry paper towel to wipe each connection and check for moisture. If you find a leak, shut off the water and tighten the leaking fitting slightly. Once the bypass is confirmed leak-free, close the bypass valve and slowly open the inlet and outlet valves to the filter housing. Again, check all connections around the filter housing for leaks.

Once you've confirmed there are no leaks, close the inlet valve to the filter. Press the red pressure-relief button on top of the filter housing to release any trapped pressure and water. Unscrew the filter sump using the supplied filter wrench. Remove the protective plastic wrapping from the new sediment filter cartridge and insert it into the sump, ensuring it's centered on the standpipe at the bottom. Apply a light coat of food-grade silicone grease to the O-ring to ensure a good seal. Screw the sump back onto the housing and hand-tighten it, then give it a final quarter-turn with the filter wrench. Do not over-tighten. Slowly open the inlet valve. The housing will fill with water. Press the pressure-relief button again until water squirts out to purge any remaining air. Open a nearby faucet and let it run for 5-10 minutes to flush any carbon fines or air from the new filter before using the water elsewhere in the house.