The only epa-registered reef-safe algaecide. Controls many types of algae in marine & reef aquariums. Will not harm marine fish, corals or other invertebrates. Keeps marine aquariums clean & clear. Add 1 ml for each 10 u.s. gal. or 5 ml for each 50 u.s. gal. repeat dose every 3 days until algae is controlled. Once algal growth is under control, add one dose per week. Poly[Oxyethylene(Dimethylimino)ethylene(Dimethyliminio)ethylene Dichloride] 16 OUNCE
