Mold and bacteria growth can cause “biofilm”, a slime buildup in your machine. A biofilm is formed when the microorganisms work together as a population and secrete a sticky polymer to form a solid matrix, which attaches to a surface. Once microbes grow into well-developed biofilms, cleaning and sanitation become much more difficult. The accumulation of scale in a water system enhances the conditions for microbial growth. Scale and the sediment it causes also leads to machine breakdown and increased parts and service costs.