Whirlout's fast and easy self-cleaning action is a fast, effective way to clean whirlpool systems, without scrubbing Removes odors, bath and body oils, soap scum, build-up,dirt and other system residues Safe and effective for hot tubs, spas, whirlpools, and jetted bathtubs. Helps prevent buildup if used on regular basis Safely cleans deep inside system pipes, pumps, fittings, and the circulation system Leaves all acrylic, fiberglass and enamel and chrome surfaces fresh and clean without scrubbing Whirlout's fast and easy self-cleaning action safely removes soap scum and build-up, odors, bath and body oils, dirt and other system residues from inside of all pipes, pumps, fittings and the circulation system. Leaves acrylic, fiberglass and enamel and chrome surfaces fresh and clean without scrubbing.