Definitions for "BIOFILM"
A complex association of microorganisms and microbial agents attached to a surface. In hot tubs and pools, they contain various bacteria, viruses, slime, mold, parasites as well as dirt and polysaccharides which add adhesion to a surface. Biofilm grows in cracks and crevices within the plumbing and forms a slippery-to-the-touch slime layer on the hot tub or pool surface. Bacteria within the biofilm are protected from antimicrobial agents such as chlorine, bromine, biguanides, algaecides, etc. by a secreted extra cellular mass that provides a barrier. These bacteria present a danger to swimmers and bathers because if they are released into the water, a bather may be contaminated before sanitizers can kill them. They can harbor very dangerous bacteria. It is therefore important to prevent them from forming in the first place. Once formed, biofilm can be very difficult to remove. In fact, most of the time, a chlorine wash is necessary to completely disinfect a pool or hot tub.
naturally occurring growth of micro-organisms on surfaces inside water mains
a thin layer of slime-like material made up of algae, fungi and bacteria NRBS - Home Table of Contents