Cleanse & Drain is designed to effectively clean hot tub plumbing by eliminating the build-up of organic waste contamination! Recommended for use prior to starting on the Mineraluxe System. Contaminants collect, grow (biofilms) and otherwise build-up in the circulation system and filter housing with poorer performing systems. Apply 24 hours prior to complete draining of the tub. Once on the Mineraluxe system, treatments of this type are generally no longer needed..