Drains must be flowing before use to allow QwicZyme to come in contact with the whole drain. First add lukewarm water.
Add QwicZyme at a rate of 1 quart per 25 cubic feet of drain. If drain volume is unknown, add enough product to ensure that the trap is full. Let stand overnight before running anything down the drain. For best results, maintain a regular program by adding QwicZyme weekly.