Roebic RV and Marine Holding Tank Treatment is designed for use in motor-homes, boats, chemical toilets, and outside latrines to reduce solids and control odors in both black water and grey water systems. The combination of ingredients, including specialized bacteria to rapidly digest solids, results in effective odor control without the use of methyl alcohol or formaldehyde. Holding tanks treated with Roebic can be dumped at any dumping station or septic tank without adding harmful chemicals to the system. An effective, economical and easy to use solution to a very common problem. 1 quart