Professional Blend Dry water soluble packets are concentrated consumer bacteria and enzyme packets and can be used all year long. Microbe-Lift/Professional Blend Dry contain cellulase enzymes, hyper cellulase producing bacteria and a cold weather bacteria (psychrophile) to accelerate the breakdown of leaves, small twigs, sediment and other accumulated dead organic waste. It can be used as a stand-alone product, combined with Professional Blend Liquid (PBL) in the spring, or in winter.