Bio-Pak portion control is easy to use with no messy liquids to spill-just drop it in! The environmentally-friendly enzyme formula starts working immediately to control odors and break down solids in the waste tank. Bio-Pak also liquefies paper, eliminating the need for special toilet paper! Completely safe for the environment and septic tanks. Continued use ensures that pipes, valves and seals will be trouble-free. Sold per Pak.