Watts’ OneFlow anti-scale system for home applications is available in 8-, 12- and 16-gal.-per-min. models. It is a single cartridge-based system that must be installed on a cold water line prior to a water-heating device, such as a tankless water heater. It uses no salt, generates no waste water and requires no backwashing, regeneration or electricity. It features a compact design and uses a physical water treatment technology known as template-assisted crystallization.