EGAGen’s Macro-Zyme™ Pond Probiotics are a safe, non-chemical approach to water quality management. Chosen by pond professionals, EGAGen’s Macro-Zyme™ Pond Probiotics are used to produce a healthy, balanced eco-system with its highly concentrated, unique blend of naturally occurring bacteria and enzymes that quickly eliminates sludge and odors. Application is simple – just apply the product in water 55° or higher and let it go to work. Shelf life of at least two years.