SpaGuard's Soft Soak Spa Conditioner gives spa owners a one-step treatment that prevents and controls the oil build-up that can cause waterline stains, while its granulated pellets are concentrated enough to only require 1 application to your spa upon start-up after your spa is drained and refilled. Soft Soak Spa Conditioner replaces the product formally known as Soft Soak Waterline Control.