The safer choice for dissolving scale. Easy-to-use powder makes a gallon of solution that removes scale deposits from coils, tankless water heaters, condensers, toilets, urinals, piping, air conditioning and refrigeration equipment, bricks, cement, tile, and marble. Inhibited to prevent against metal corrosion. Safer for metals than other mineral acids. Chemically stable and can be stored longer than similar products. Contains red trace dye that shows when it’s flushed from a system. Won't cake. Safer to handle and store than liquids. Much less toxic than most other scale dissolving methods. No odor. No dangerous fumes. NSF Registered as a Nonfood Compound Program Listed A3.