Hot Tub SERUM® Maintenance Liquid is an EPA registered product. It aids in the removal of non-public health bio-film and microorganisms. It is designed as a weekly addition to your customer sanitization regiment. The use of Hot Tub SERUM® Maintenance helps to flush out the bacteria that your current sanitizers can’t. It reaches down deep into the plumbing of the hot tub to help prevent the reoccurrence of contaminants that can plague every hot tub. The weekly use of Hot Tub SERUM® Maintenance will help to keep the water crystal clear, soft and clean. It will also aid to help prevent the occurrence of white water mold and control the swings in PH.