AquaFinesse is a natural, environmentally friendly water treatment system. It is not a sanitizer, but it does play a vitally important role in the control of bacteria.Biofilm is a slimy substance that is created by bacteria for use as a safe shelter, feeding and breedibg ground. Needing somewhere safe, bacteria creates slime (biofilm), which enables them to stick to any damp surface area (walls, steps, filter housing, jets and the plumbing). The moment AquaFinesse is added to the water it begins the process of breaking down and loosening biofilm from surfaces.