Soft Soak by Spa Guard Stain & Scale Control for Spas & Hot Tubs is Bromine-free and Chlorine-free. Prevents stain and scale on spa surfaces. For start-up at 1 oz. per 150 gallons of water and circulate water for 30 minutes. Weekly add 1/4 oz. per 150 gallons of water. Net contents: 1 pint.