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Natural Enzyme Deodorizer & Waste DigesterBio-Pak provides portion control and is easy to use with no messy liquids - just drop it in! The environmentally friendly enzyme formula starts working immediately to control odors and break down waste and paper in the waste tank. Continued use ensures that pipes, valves, and seals will be trouble-free. Removes odors and breaks down waste and paperBiocide-freeFormaldehyde-freeZinc and Copper FreeSafe for septic tanksCalifornia Compliant