The Hot Tub Serum Total Cleanse Watercare 2 oz. is step 1 of 2 of the total cleanse process. This unique process and special formula deep cleans to erase gunk and build-up as well contaminants in spa plumping. It is designed to keep your hot tub water fresh without the use of harsh chemicals, creating water that feels silky and soft while properly cleaning pipes and jets. Each jar can purge your hot tub's water system up to three times.