Macro-Zyme is the perfect choice for the control and elimination of sludge and foul odor in tanks, ponds, and lakes. Once introduced, Macro-Zyme quickly releases billions of friendly and beneficial bacteria and enzymes that work around the clock to clear, neutralize, and purify water. Used by professionals since 1991, this concentrated professional grade formula was the first on the market to introduce a 1-step maintenance program that utilizes natural bacteria and enzymes to rapidly biodegrade top and bottom sludge while reducing components that contribute to sludge build up in ponds of all sizes. Macro-Zyme will also reduce nitrates and phosphates. These bacteria, as well as the bacteria in Macro-Zyme + will:. Reduce odors in 24 hours or less. Rapidly remove dead grass, leaves, paper, fish waste, and sludge. Clear water and help restore a healthy oxygen level Item / Description / Treatment Area / Reapplication / Typical Use 60502. Macro-Zyme Beneficial Bacteria (6) 1 oz water soluble bags (MPN MZ1) / 6 pk. of 1 oz. ws bags / Up to 6,000 gal. / Every 3 weeks / Small pond / watergarden