Macro-Zyme is a bacteria that can be applied to your pond in order to reduce the amount of nitrogen and phosphorus present in the water column. These are the nutrients which are responsible for causing excessive amounts of plant and algae growth within a pond. These bacteria will also digest organic compounds such as animal feces and ammonia. Reducing the levels of these compounds can increase water clarity and decrease the foul odors that are associated with them. This product is nontoxic, will not harm your fish, and is safe for both humans and animals such as livestock and local wildlife. Bacteria is sold in 8oz dissolving bags.