Boost Specifically designed to be used with Free, new Leisure Time Boost is a non-chlorine, liquid shock formulated to break down oils, lotions and other organic materials. Features: Specificall designed to be used with Free 7.5% hydrogen peroxide Applications: During Start-up: Boost is added after Control during start-up. Weekly Maintenance: Control is added on a weekly basis and the amount is based on the spa usage. Sizes: quart Tips: Always allow product to circulate in water for 15 minutes with jets on prior to adding another product. Compatible With: Free products are compatible with the Leisure Time Simple Spa Care specialty line of products. Advantage: Boost improves filtration while keeping water clean and clear. Same as: BaquaSpa Oxidizer (Shock) - Baqua Spa