Toilet chemical Begin using TST today, no need to clean other products out of holding tank first Freshen, clean and lubricate your holding tanks-both gray and black water systems 100% biodegradable and safe for the environment Coconut oil soap cleanses the system with an agitation action, and lubricates valves and seals to prolong equipment life while it prevents sending units from misreading Coconut oil lubrication keeps waste off the walls For use in RVs and boats, and safe for septic tanks Does not contain poisonous formaldehyde or blue staining dye Fresh clean fragrance Use only 2 ounces per 10 gallons