Algatec® is a synergistic algaecide, water clarifier and chlorine booster for all types of swimming pools. Algatec® helps improve water quality and swimmer comfort in swimming pools, spas and hot tubs. It kills green and yellow algae in 4 to 24 hours and eradicates black algae (fungus) in 7 to 10 days. Scaletec Plus® is a high performance calcium descaler, iron stain, scum remover and preventative. Removes hard water buildup from pool surfaces, tile and equipment without scrubbing or acids.