The mechanics of softening every drop of water in your home

How to Install a Whole-House Water Softener | Ask This Old House · 5:13 · Video: This Old House · Watch at the source

In short: Installing a whole-house water softener is a significant plumbing project that requires precise connections to ensure consistent water quality. This guide breaks down the technical steps needed to integrate a resin and salt system into your existing main line.

Expert Richard Trethewey demonstrates the installation process, which begins by tapping into the existing cold-water pipe using a tubing cutter. The system relies on a resin tank connected via a copper pipe assembly with three valves, and a salt tank linked by 3/8-inch-diameter plastic tubing with compression fittings.

Key technical requirements include installing an air-gap fitting for the drain line to the sewer pipe and connecting the washing machine discharge hose to that same fitting. The process concludes by filling the salt tank and restoring water flow at the meter.

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