NEW Before you drain your hot tub try SilkBalance™ Clean Start! A cleanser and purge for your bath or spa plumbing system. It will eliminate bio-film, the number one source of bacteria, including spa moulds, both white and black. The only purge product that will not create foaming residue that would require multiple flushes to remove. This concentrated liquid formula is specially blended to work with water of all hardness levels and is designed to deep clean the spa pipes, jets and plumbing equipment.