Our special water-soluble formula prevents seal wear, sticky drain valves and keeps all the plumbing lines operating smoothly. Approximately 2 ounces in the holding tank effectively lubricates drain valves, lines and walls. Lubricates holding tank systems and drain valves from the insideRestores easy valve operationCoats plumbing lines for smooth tank evacuationWorks in both grey and black water tanks100% biodegradable liquid