40278 Water Softener |verified| Jun 2026

May struggle with very large households (5+) or extremely high water usage. Expert & Community Consensus Users from Reddit's r/WaterTreatment often compare the Morton M30

While LWC water is low in iron, old galvanized pipes within your home can leach iron. Fix: Use Iron Out salt pellets or add a resin-bed cleaner every 6 months.

Before agreeing to any install, ask the plumber, “Do you test for pressure drop after the softener?” In 40278, municipal pressure can spike to 90 PSI—too high for most softeners. You may need a pressure reducing valve (PRV) installed first.

If you own or are looking to service a 40278 water softener, you are dealing with a classic Kenmore high-efficiency water treatment system. Originally sold under the Sears Kenmore brand (often designated as model 625.402780 or similar), this unit is a 41,000-grain high-efficiency water softener designed to handle hard water challenges for medium to large households. 40278 water softener

A: No. Louisville Metro does not require a plumbing permit for a water softener, but you must install a backflow prevention device if you have an irrigation system tied in after the softener.

Pair a 40278 water softener with a AquaTru or APEC RO-90 for drinking and cooking.

Take a broom handle and gently push down into the salt tank. If a hard crust has formed over an empty pocket of water, break it up. May struggle with very large households (5+) or

Apply silicone grease to all rubber parts. Re-seat the rotor disc, fasten the cover plate evenly in a star pattern, and restore water pressure slowly to check for leaks. Maximizing the Lifespan of Your System

Shift your bypass valve to the "Bypass" position to isolate the unit from home plumbing.

Over time, moving parts and rubber seals inside the 40278 valve wear down due to friction and chemical exposure from city or well water. Keeping these core components in good condition prevents leaks and regeneration failures. 1. Valve Rotor and Seal Kit Before agreeing to any install, ask the plumber,

If you want to dive deeper into repairing or setting up this system, tell me:

Ensure the bypass handle is pushed fully into the "Service" position.