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OneFlow Anti-Scale System

Series OFTWH OneFlow Anti-Scale System provides protection from scale formation on internal and external plumbing surfaces. OneFlow is a single cartridge-based system that must be installed on a cold water line prior to a waterheating device (water heater or tankless water heater) for single tankless heaters. The system prevents scale by transforming dissolved hardness minerals into harmless, inactive microscopic crystal particles. These crystals stay suspended in the water and are passed to the drain. The OneFlow system requires very little maintenance, no backwashing, no salt, and no electricity. Typical hardness problems, especially buildup of scale on heating elements, pipes, water heaters, boilers, and fixtures, are no longer a concern.


  • Maximum flow rate: 10 gpm
  • Environmentally-friendly technology requires no electricity and generates no wastewater
  • Chemical-free, salt-free scale prevention and protection system that improves efficiency of all water heating devices and downstream plumbing components
  • Simple shutoff and filter change with inlet ball valve and filter wrench – filter cartridge only needs to be changed every two years

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Select options below to identify the UPC, Order Code, and Repair Kit for a specific OFTWH