Product Review

Kill and prevent green, black, and mustard algae with the HTH Super Extended Algae Guard 3-Month Algaecide for Swimming Pools. This non-foaming formula works well in vinyl and plaster pools. One dose keeps your pool algae-free for three months. Choose from select quantities. Use against green, black, and mustard algae. Single treatment lasts 3 months. Can be used in vinyl and plaster pools. Non foaming.