40278 Water Softener Guide

This is a DIY-friendly part for experienced plumbers (requires soldering or push-fit adapters), but if you are unsure about programming the hardness settings, a professional installation is recommended. Always bypass your softener before removing the old valve.

, use distinct model formats such as "Kenmore 350" or "Fleck 5600." 40278 water softener

The Whirlpool 40278 is a designed for average to large households. It’s part of Whirlpool’s trusted “Pro Series” lineup. Unlike basic cartridge filters, this is a salt-based ion exchange system —the gold standard for removing hard minerals like calcium and magnesium. This is a DIY-friendly part for experienced plumbers