Calci-Free is an efficient chemical descaler specifically formulated for tankless water heaters found in residential and commercial applications. Tankless water heater cleaner is easy to use with no strong odor. Can easily be applied to any type of tankless water heater. No splash crystal product. Fast acting and cleans heat exchanger quickly. More effective than vinegar; restores water flow, pressure, and circulation in twenty minutes. Calci-Free tankless water heater flush; 1.2 lbs. Contains a unique combination of organic and inorganic cleaners and patented corrosion inhibitors. For routine cleaning to remove calcium and other solid deposits from heating coils in tankless water heaters. FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets.