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Helps prevent clogs and pyramids: Bio-Paks natural enzyme formula liquefies waste and toilet paper, helping prevent the buildup that can make RV black tanks harder to empty and maintain. Breaks down any toilet paper: Theres no need to purchase the thin,1-ply RV toilet paper. Go ahead and upgrade to the plush 2-ply. Just use plenty of water with each flush. Controls odors for up to 7 days: Neutralizes odors at the source while helping keep your RV black tank cleaner and easier to maintain throughout your trip. Fast, mess-free drop-in treatment: Walex rapid-dissolve technology helps the water-soluble packet dissolve quickly and start working immediatelyno measuring, pouring or spills. Commercial-grade performance for you RV: Originally formulated for portable restrooms by Walexs on-site R&D team; formaldehyde-free and bronopol-free for use in RVs, boats, and portable toilets.