PIRANHA is the most cost-effective holding tank product on the market! The advanced enzymatic technology in PIRANHA packs a super-high bacteria count and fast-acting enzymes into a very safe and easy-to-use product, capable of digesting all solid waste. PIRANHA is specially formulated for fast, effective waste digestion and sludge removal. For use in holding tanks in RV's, Boats, Airplanes, and Buses. Also great in portable toilets and home septic systems. Contains NO FORMALDEHYDE!