Softener: 40278 Water

Test your water. If the municipal report says "150 PPM," divide by 17.1 to get grains (8.7 grains). Add 5 grains if you have iron (ferrous). Program the 40278 to 13 or 14 grains.

The Whirlpool 40278 is a workhorse. It’s not the flashiest or the cheapest upfront (especially after buying the brine tank), but it delivers where it matters: soft water, reliably, for years. The metered regeneration alone will pay for the system in salt savings over a few years.

If you can handle the separate brine tank purchase and a weekend of plumbing (or hire a pro), this is one of the best value picks in the 40k-grain class.

Have you installed a Whirlpool 40278? Share your experience in the comments below!

Soft Water Made Simple: A Guide to the Kenmore 420 (40278) Water Softener 40278 water softener

If you're dealing with stubborn soap scum, dry skin, or scale buildup on your faucets, the Kenmore 420 Series (Model 40278) is a powerhouse solution designed for medium to large households. Known for its reliability and efficiency, this 40,000-grain system is a favorite for those wanting better water without constant maintenance. Key Features and Performance

The Kenmore 40278 is engineered to handle demanding water conditions, including high hardness and clear water iron.

40,000-Grain Capacity: Ideal for households of 1–6 people, providing ample soft water even during peak usage.

IntelliSoft® Technology: This system doesn't just run on a timer; it monitors your actual water usage to regenerate only when necessary, saving you up to 35% in salt and water. Test your water

High-Flow Valve: Maintains your home's water pressure, so you won't notice a drop in the shower when someone else turns on a faucet.

Clear Water Iron Removal: Effectively reduces up to 8–10 parts per million (ppm) of clear water iron, preventing those unsightly orange stains on laundry and fixtures. Installation & Specifications

Designed for the DIY enthusiast, this unit features a compact, single-tank design that fits into tight spaces like basements or utility closets. Specification Model Code Max Hardness Service Flow Rate 7.7 - 8.0 GPM Regeneration Water ~36.3 gallons per cycle Pressure Range 20 – 125 PSI Maintenance and Troubleshooting

To keep your Kenmore 40278 running for its expected 8–12 year lifespan, follow these simple tips: Have you installed a Whirlpool 40278

Water softener bypass: what it is and how it works - Culligan

Q: Do I need a permit to install a water softener in 40278? 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.

Q: Where can I buy salt for my 40278 water softener? A: The Meijer on Dixie Highway and the Walmart Supercenter on Bashford Manor Lane both sell 40-lb bags of pellet salt for $6–$8. For bulk deals (10+ bags), try Rural King in Clarksville (just across the bridge).

Q: My neighbor says 40278 water is “already soft.” Are they wrong? A: They might be confusing “clean” with “soft.” LWC water is safe and tastes good, but at 11 GPG, it’s objectively hard. Ask your neighbor to check their showerhead for white scale. If it’s there, they need a softener too.

If you have landed on this page, you are likely tired of the chalky white residue on your faucets, the dry skin after a shower, or the skyrocketing cost of soaps and detergents. You are searching for a solution to hard water, and a specific model has caught your attention: the 40278 water softener.

But is the 40278 model right for your home? In this 2,500+ word guide, we will dissect everything you need to know about this specific unit—its specifications, installation, maintenance, and whether it actually saves you money.