Biological Tank Deodorizer. Biological cleaner for black water tanks that controls bad odours effectively. Its new liquid formula is completely natural based on a selection of bacteria designed to ecologically replace the products used in chemical toilets, and gray and black water tanks. It liquefies and digests organic matter, prevents the development of microorganisms that cause bad odours, protects the pipes, facilitates their emptying while reducing maintenance costs. Once the organic matter has been emptied, it reinforces the activity of the purifying bacterial flora of the pipe system.