Sirona Spa Care Simply Waterline Control – Step 1 in The 3-Step Sirona Simply Chlorine-Free & Bromine-Free System for Spas & Hot Tubs, 32 fl oz (82106)Brand: Sirona Color: Clear Features: STEP 1 IN THE SIRONA SIMPLY SYSTEM: Use as the first step in the 3 step Sirona Simply System Step 1: Sirona Simply Waterline Control, Step 2: Sirona Simply Oxidizer, and Step 3: Sirona Simply Sanitizer PREVENTS WATERLINE DEPOSITS: Unique, patented formula controls and prevents the formation of stubborn waterline deposits, keeping your spa shell cleaner and smoother and your water feeling softer and more inviting