SAFECID Safe Calcium Scale Remover and Cleaner PS-HAR101QTS Pool & Spa Descaler Swimming Pool Scale Remover Tile Scale Remover Hot Tub Chemical (Quart Sprayer) Multi Purpose Scale Remover Safe Calcium Scale Remover Descales and removes lime, calcium, scale, mineral deposits and rust stains from tile, metal, wood, plastic, vinyl and fiberglass pools, spas and hot tubs. Dissolves calcium and lime buildup quickly and safely. No scrubbing! Won't harm generator cell plates or heating units. Product carries a triple zero HMIS (hazardous materials index system), is noncorrosive, nonhazardous, non US DOT and Canadian TDG regulated. Product has proven to be nondestructive, will not cause irreversible alterations in human skin tissue.