WSP 120,000 Grain Twin-Tank Water Softener

The WSP 120,000 Grain Twin-Tank Water Softener is designed for homes or buildings where soft water is essential at all times, even during system regeneration. It handles hard water continuously without interruption, ensuring your water feels smooth and clean around the clock.

The problem you’re facing

If you have hard water, you’re probably dealing with spots and scale buildup on faucets and shower doors. Maybe your coffee doesn’t taste quite right, or your towels feel stiff after washing. You might notice an orange ring around your toilet tank or spend extra time scrubbing mineral deposits off your appliances. And if your water softener ever goes offline for regeneration, you lose soft water until it’s done—which can be a real hassle if you rely on softened water throughout your home or business.

Why hard water causes these issues

Hard water contains minerals like calcium and magnesium that don’t dissolve. When water heats up or sits on surfaces, these minerals settle out and leave behind scale and stains. The only way to check if hard water is what you have is with a simple water hardness test, which measures these minerals. If your test shows hardness above 7 grains per gallon, the problems you see are almost certainly caused by hard water.

What it costs to leave hard water untreated

Hard water shortens the life of your water heater and other appliances by causing mineral buildup inside. You end up using more soap and detergent to get things clean, which isn’t just wasteful—it can leave residue on your skin and clothes. Appliances work harder, using more energy to heat water or wash laundry. Stains from hard water become tougher to remove over time, turning surfaces dull and gritty. Over the years, this adds up to more repairs, maintenance, and time spent cleaning.

How this system helps reduce hard water problems

The WSP 120,000 Grain Twin-Tank Water Softener works on ion exchange—the same process used in most quality water softeners. It swaps the minerals that cause hardness for sodium ions, which don’t cause scale or stains. The twin-tank design means one tank is always working to soften your water, while the other regenerates (cleans itself) in the background. This way, you don’t lose softened water during regeneration, keeping your taps soft and scale-free continuously.

What this system can handle

This unit can treat hard water up to its 120,000-grain capacity before it needs to regenerate. Because it uses twin tanks controlled by a reliable Fleck 9500 meter valve, it manages high flow rates suitable for large homes or small facilities. It only regenerates based on actual water use, which saves salt and water compared to systems on a fixed schedule. The system can work hard for families or businesses that can’t afford any soft water downtime. It’s a step up from smaller single-tank units by providing uninterrupted soft water even during cleaning cycles.

What you actually get

The system includes a pressure vessel (the tank) covered by a lifetime warranty, ensuring lasting durability for the part that holds your water treatment media. It comes with a bypass valve included, so you can easily isolate the softener for servicing without shutting off water to your home or building—a convenience competitors often charge extra for. You also get 10 feet of discharge hose for the drain line, ready to connect your system during installation.

Is this the right size for you?

This twin-tank system suits homes or facilities that must have soft water flowing all the time, even during regeneration cycles. If you run a large household, a small commercial site, or anywhere soft water can’t pause, this is the sensible choice. Smaller single-tank softeners might be more economical if you can go without softened water briefly while the system regenerates. For very large commercial needs, a different, more industrial setup would be better.

Living with it

Maintenance mainly involves occasional refilling with salt and monitoring the system’s operation. Because the system regenerates based on how much water you use, it won’t run more often than it needs to, which saves salt and water. You’ll need to clean or replace parts according to the manufacturer’s recommendations, but the pressure vessel’s lifetime warranty gives peace of mind for the main tank. Your local plumber handles installation and any servicing you require.

What it won’t do

This system reduces hardness but doesn’t remove other water issues like iron stains, sulfur smells, sediment, or bacteria. If your water has those problems, separate filtration or treatment will be needed. It’s designed strictly for managing hard water and keeping soft water flowing without interruption.

Why buy it from us?

Water Softener Plus offers parts and serviceable components so your system stays fixable and maintainable for years, not a sealed disposable unit. Our equipment ships free within the U.S. from Tampa, Florida, backed by a 90-day money-back guarantee. We provide free, expert sizing help to confirm the right configuration for your water and needs—just share your water problem and ZIP code. Our team knows these systems inside out and supports you long term.

Included with this system

• Lifetime warranty on the tank. The control valve and electronics carry the manufacturer's own warranty.
• Bypass valve included, so the system can be isolated for service while water keeps running to the house.
• 10 feet of discharge hose for the drain line.

Specifications

What this system handles

• Scale on fixtures and glassware
• Soap that won't lather
• Stiff laundry and towels
• Scale inside the water heater

The next step

Request a free quote and sizing from our WSP experts. Provide your water problem details and ZIP code, and we’ll confirm the best setup and send pricing tailored to your situation.