RectorSeal® Calci-Free™ Tankless Water Heater Cleaner, Fast Acting, 1.2 lb, Bottle, Solid, White, Composition: Sulfamic Acid, 2.126 Specific Gravity

Cleans heater coils thoroughly. Restores pressure and circulation in minutes, with no strong odor. Calci-Free™ is a unique, economical, biodegradable cleaner containing a combination of organic, inorganic and corrosion inhibiting ingredients. It is easy to use and works twice as fast as other cleaners. Use it for routine cleaning to remove calcium and other solid deposits from heating coils.