If you're looking for one algaecide that does it all, look no further than Algimycin 2000. This EPA registered algaecide is so powerful it kills, prevents and controls black, green and yellow algae. Works fast without foaming or staining. This powerful E.P.A. registered algaecide is a blend of several components that work synergistically to control all types of swimming pool algae. Used weekly, it prevents algae outbreaks in the pool.