Clack WS1 Review: An Installer’s Honest Take
Sep 30, 2026The short version: the Clack WS1 is a 1-inch control valve for water softeners and filters, made by Clack Corporation, a family-owned Wisconsin company that started in 1944. It meters your actual water use, flows 27 gallons per minute, keeps its settings through power outages, and is built around one piston that a technician can rebuild instead of replacing the whole valve. It’s the valve we build our own Hydrology Essentials softener on. The catch: it’s only as good as the person who sizes and programs it.
What the Clack WS1 actually is
Every softener has two parts that matter: the tank of resin that does the softening, and the control valve on top that decides when to regenerate, how much salt to draw and how long to rinse. The valve does the most work and wears the most, so the valve brand matters more than the logo on the tank.
The WS1 is Clack’s 1-inch residential valve. It shows up on softeners, carbon filters, iron filters and other media tanks, which is part of why so many independent installers use it: one valve family, one set of parts, many jobs.
| Spec | Clack WS1 |
|---|---|
| Service flow | 27 gpm at a 15 psi drop (with meter, bypass and 1.25″ fittings) |
| Backwash flow | 27 gpm at a 25 psi drop |
| Tank sizes | 6″ to 21″ diameter, softener or filter |
| Plumbing connections | 1″–1.25″ NPT; ¾″–1.5″ sweat or solvent; SharkBite and John Guest options |
| Regeneration modes | Meter immediate, meter delayed, or time clock delayed; downflow or upflow brining |
| Power | 15-volt DC wall power supply |
| Memory | Settings stored in nonvolatile memory; coin-cell battery carries the clock about 8 hours |
| Body / drive | Fiber-reinforced composite body, single reciprocating piston |
From Clack Corporation’s published WS1 specifications.
What holds up in the field
- It regenerates on real water use. In meter mode the WS1 counts gallons and regenerates when the resin is actually used up, not on a fixed calendar. That saves salt and water compared with an old clock-timer valve, especially in homes where people come and go.
- It keeps its settings. Hardness, capacity and cycle times live in nonvolatile memory. After a Florida storm knocks the power out, you may need to reset the clock, but the program is still there.
- It can be rebuilt. The moving parts are a piston and a stack of seals and spacers. When those wear, a technician replaces them in the valve body with a standard kit instead of replacing the whole valve. Worn spacers and seals are one of the most common reasons an older softener stops drawing brine.
- It isn’t locked to one dealer. Parts are standard and the valve is non-proprietary, so if you move or your installer retires, another qualified tech can service it.
The honest downsides
- Setup decides everything. Program the wrong hardness or capacity and a good valve wastes salt or lets hard water through. Ask whoever quotes you what grain number they set it to and where it came from.
- You usually can’t buy one on its own. Clack sells through system builders and dealers, so most homeowners get a WS1 as part of a complete softener.
- It needs power and shade. It runs on a 15-volt wall adapter, and outdoor installs in Florida sun should have a valve cover. We put covers on every outdoor valve we install.
- Chloramine still matters. No valve protects the resin from Manatee County’s chloramine. That’s the job of catalytic carbon ahead of the resin.
Clack WS1 vs. Fleck 5600SXT
The Fleck 5600SXT is the other valve you’ll see on most quotes. Both are proven. Fleck has been around longer and parts are everywhere; the WS1 is a newer single-piston design that many independent installers prefer for quiet operation and easy service. We put the full comparison here: Fleck vs. Clack: which softener valve is better?
Who the WS1 is right for
For most single-family homes on city or county water, a WS1 is plenty of valve. It handles the flow of a typical home with several bathrooms running at once. Very large homes, homes with high-flow fixtures, and light commercial jobs may step up to the WS1.25 or larger. On a private well, the WS1 works fine as a softener or filter valve, but iron and sulfur usually need their own treatment first.
How we use it
Our Hydrology Essentials softener is one tank with 1 cubic foot of softening resin, a quarter cubic foot of catalytic carbon and a quarter cubic foot of activated carbon, on a metered Clack valve. It’s our value-built option and starts at $2,995 installed. It is not third-party certified as a system. If you want a WQA Gold Seal certified whole-home system, we offer Puronics equipment too, and we’ll show you both after a free test.
Common questions
Is the Clack WS1 a good water softener valve?
Yes. It meters actual water use, flows 27 gpm, keeps its settings in memory, and can be rebuilt with standard parts. How well it performs depends mostly on correct sizing and programming.
Where are Clack valves made?
Clack Corporation is a family-owned company headquartered in Windsor, Wisconsin, and it lists its WS1-series valves as made in Wisconsin.
Can I buy a Clack WS1 valve myself?
Usually not by itself. Clack sells through system builders and dealers, so homeowners normally get the WS1 as part of a complete softener or filter.
What happens to a Clack valve when the power goes out?
The program stays in nonvolatile memory and a small battery carries the clock for about 8 hours. After a longer outage you may need to reset the time of day, but the settings remain.
How long does a Clack valve last?
The body is built to last; the wear parts are the piston, seals and spacers. When those wear, a technician can replace them inside the valve instead of replacing the whole softener.
Does Hydrology install Clack softeners?
Yes. Our Hydrology Essentials softener runs on a metered Clack valve, and our own techs install and service Clack valves across Manatee and Sarasota counties.
Want a Clack-valve softener sized to your water? We test your hardness and chloramine free at your tap, then show you the options. Call or text 941-266-8991.
Related: Fleck vs. Clack · What a Clack softener costs · Clack models explained · Clack WS1 error codes · Replacing a Fleck with a Clack
Sources: Clack Corporation WS1 product specifications and company history (clackcorp.com); Hydrology install and service records, 2026.
