For use in RV and Marine gray water tanks, this newly formulated cleaner is environmentally safe and designed to eliminate odors. Formula will also help prevent grease buildup. For use in drains, sink traps, and waste vents, the deodorizing cleaner only requires 4 oz. per 40 gallons to eliminate foul odors and leave behind a fresh lemon scent. 32 oz. Eliminates foul odors and grease buildup Leaves behind a fresh lemon scent | TST Grey Water Odor Control