Clack has been a trusted name in water treatment since Founded 1946, based in United States. The brand is particularly known for The WS1 water softener control valve — the most widely used residential water treatment control valve in North America. Clack is positioned in the mid-range price tier, making it a solid mid-range option for water treatment.
Clack Water Treatment
Clack manufactures the industry-standard WS1 and WS1.25 control valves used in water softeners and filtration systems worldwide. Their product line includes metered and timed control valves, brine valves, mineral tanks, and accessories that form the heart of most residential and light commercial water treatment systems.
Mid-RangeBalanced quality and affordability
Clack Water Treatment Product Lines
WS1 Control ValveWS1.25 Control ValveWS1.5 Control ValveBrine ValvesMineral Tanks
Why Choose Clack for Water Treatment?
Clack stands out in the water treatment market because of The WS1 water softener control valve — the most widely used residential water treatment control valve in North America. Their products carry 3 industry certifications, including NSF/ANSI 44, NSF/ANSI 61, WQA Gold Seal, giving homeowners confidence in quality and compliance. Clack backs their water treatment with a 5-year limited warranty on control valves; 10-year on tanks, which shows commitment to long-term reliability. With 5 dedicated product lines — WS1 Control Valve, WS1.25 Control Valve, WS1.5 Control Valve, Brine Valves, and more — there's a Clack option for virtually every need and budget.
Certifications & Standards
NSF/ANSI 44NSF/ANSI 61WQA Gold Seal
Warranty & Support
Warranty5-year limited warranty on control valves; 10-year on tanks
Phone Support1-608-846-2586
Official Websitehttps://www.clackcorp.com
Where to Buy Clack Water Treatment
Water Treatment How-To Guides
View All →How to Install a Reverse Osmosis System
Install an under-sink reverse osmosis system for the cleanest drinking water at home -- feed water connection, filter mounting, storage tank, drain saddle, dedicated faucet, and the critical initial flush.
How to Test Your Water Quality
Test your water with DIY strips, reagent kits, or certified lab analysis -- what to test for, how to collect samples, how to read results, and what treatment actually fixes common contaminants.
How to Change Water Filter Cartridges
Swap out sediment, carbon, and specialty cartridges in whole-house and under-sink systems -- the right filters, the right schedule, and the correct order for multi-stage setups.
Common Water Treatment Problems
View All →Bad Taste or Odor in Water
Water that tastes or smells off -- chlorine, rotten eggs, metallic, musty -- has a specific cause for each type. Identifying what it tastes or smells like is the fastest path to the right fix.
Hard Water Buildup
White, chalky deposits on everything -- faucets, shower heads, glass doors, inside pipes and water heaters. Calcium and magnesium restrict flow, kill efficiency, shorten appliance life. About 85% of US homes have hard water.
Low RO System Output
RO system filling slowly, weak trickle, or running out of water? Clogged pre-filters, worn membrane, low feed pressure, or waterlogged tank. Most fixes are filter replacements or pressure adjustments.
Water Treatment Types
View All →Water Treatment Buying Guides
View All →Clack Water Treatment FAQ
Is Clack a good brand for water treatment?
Clack Corporation is a leading manufacturer of control valves, brine valves, and accessories for residential and commercial water treatment systems. Founded in 1946 and headquartered in Windsor, Wisconsin, Clack is known industry-wide for their WS1 control valve — the most widely used water softener control valve in North America. Their products are sold through water treatment dealers and distributors, not directly to consumers, making them an essential OEM partner for water treatment equipment manufacturers.
What warranty does Clack offer on water treatment?
Clack offers 5-year limited warranty on control valves; 10-year on tanks.
Where is Clack made?
Clack is based in United States, headquartered in Windsor, Wisconsin.
What price range does Clack water treatment fall into?
Clack is positioned in the mid-range price tier for water treatment. They balance quality and affordability well.
What water treatment product lines does Clack offer?
Clack offers 5 water treatment product lines: WS1 Control Valve, WS1.25 Control Valve, WS1.5 Control Valve, Brine Valves, Mineral Tanks.
What certifications does Clack have for water treatment?
Clack holds 3 certifications including NSF/ANSI 44, NSF/ANSI 61, WQA Gold Seal.