Step 3 · Measure and Cut the Main Water Line

This is the step most people slow down on. Take it one move at a time — there’s no rush, and you can rewind the clip as many times as you need.

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.