Microbe-Lift Autumn/Winter Prep helps accelerate the decomposition of leaves, sediment and other organic matter during the fall and winter months. It will also jump start your pond to a healthier environment in the spring. A two part system of liquid bacteria and dry, water soluble packets containing a blend of cellulose enzymes Continues To Provide Sustained Biological Activity Even In Water Temperatures Under 40 Degree Fahrenheit If Frozen, Bacteria Will Remain Effective After Thawing Out; Cellulose Producing Bacteria And A Cold Weather Bacteria Easy to Dose in Fall or Spring Reduce Buildup of Organic Debris