Cleanse and clarify your spa water with Leisure Time Boost Spa Shock. Specifically designed to work with the Leisure Time Free system, this non-chlorine liquid shock breaks down oils and lotions for improved filtration and a clear spa. With a 7.5% hydrogen peroxide formula, simply add 3 oz. per 150 gallons for start-up and 1.5-3 oz. weekly for maintenance. Compatible with other simple spa care products.