GreenClean Granular Algaecide works on contact to control algae in water gardens ornamental ponds fountains and other water features. Through its patented formula GreenClean immediately begins fighting algae blooms releasing vital oxygen into the water body as it biodegrades. GreenClean also quickly eliminates algae on a wide variety of surfaces such as birdbaths statues and walkways. GreenClean comes ready to use. Homeowners can enjoy their water features without all the guesswork or complicated directions and without the wait. GreenClean begins working within 60 seconds of application. OMRI listed for organic production.