Walex Bio-Pak RV Natural Enzyme Deodorizer provides portion control and is easy to use with no messy liquids â 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. Bio-Pak liquefies all types of toilet paper, eliminating the need for special toilet paper.• Advanced enzyme system removes odors and cleans tank• Pre-packaged portion control â no spills• Rapidly breaks down waste and paper• Biocide-free• Formaldehyde-free• Zinc and copper-free• Safe for septic tanks• California compliant Continued use ensures pipes, valves, & seals will be trouble-free Pre-packaged portion control is easy to use with no messy spills Environmentally friendly, biocide-free, zinc & copper-free, & California-compliant | Walex Bio-Pak RV Natural Enzyme Deodorizer and Waste Digester, Ocean Mist, 10-Pack