Use Prior to Draining to Clean Plumbing.
Drain Prep is designed to effectively clean hot tub plumbing by eliminating the build-up of organic waste contamination! These contaminants collect, grow (biofilms), and otherwise build-up in the circulation system and filter housing. Use prior to every complete draining of the tub. By purging the hot tub of this organic build-up, the symptoms of contamination will be reduced or eliminated.