Powerful probiotic blends of naturally-occurring heterotrophic bacteria specifically chosen for their ability to quickly digest organic sludge common in aquariums. Sludge includes fish waste, leftover food and other decaying organic matter. When left unchecked, sludge can lead to unsightly algae growth. Rather than relying on freshwater bacteria to treat both fresh and saltwater, Fritz Industries has identified the species that naturally occur and perform best for each environment. FritzPond FritzZyme® 360 contains only species of bacteria native to freshwater. The bacteria in FritzPond FritzZyme® 360 is safe, non-toxic and non-pathogenic.