Pool Mate 1 qt. Pool Black Algaecide (2-Pack)

Pool Mate Black Algaecide is a 60% poly algaecide perfect for preventing algae growth and killing existing black, green and yellow/mustard algae. Pool Mate Black Algaecide also helps clear up cloudy water. It does not affect pH, will not stain surfaces or leave residue. This product is non-foaming, non-metallic and allows swimming immediately after use. Use weekly to prevent algae growth.