BioGuard Algae CompleteBioGuard Algae Complete Once a week dual action algaecideFor all swimming pool types Prevents and Kills green, mustard and black algae BioGuard Algae Complete is a highly effective fast acting swimming pool algae destroyer. Algae Complete kills all types of swimming pool algae including black, green and mustard algae. Algae Complete is formulated to complement most swimming pool sanitizers. Effective and non staining when used as directed. When used