Safe Fountain Calcium Scale Remover & Cleaner F-HAR101 Descaler removes Lime, Calcium, Scale, Mineral deposits, Rust Stains from Fountains (Quart) Easily removes scale and calcium build and keeps fountains clean from buildup. Nontoxic, nonfuming, nonmutagenic, no VOC's. Product carries a 0-0-0 HMIS (hazardous materials index system), is noncorrosive, nonhazardous, non US DOT and Canadian TDG regulated. No disposal restrictions. Product has proven to be nondestructive, will not cause irreversible alterations in human skin tissue