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Kasco’s Macro-Zyme Beneficial Bacteria is the perfect choice to control and eliminate sludge and foul odors in tanks, ponds, and lakes. Macro-Zyme contains a high concentration of facultative anaerobic bacteria that will rapidly reproduce and consume organic material in your pond or lake. When introduced in your water, This easy-to-use product quickly releases billions of beneficial bacteria & enzymes that work around the clock to clean, neutralize, and purify. Application is simple — just apply Macro-Zyme in water 55°(F) or warmer and let it go to work.