Autumn / Winter Prep helps accelerate the decomposition of leaves, sediment and other organic matter. It will also jump start your pond to a healthier environment in the spring. This two-part system of dry and liquid bacteria, water soluble packets containing a blend of cellulase enzymes, cellulase-producing bacteria, a cold-weather bacteria, and cellulase enzymes are the key to accelerating the breakdown of leaves, organic sediment and sledge all winter long.