Check the listing for details. Applied Biochemists Prevent Plus 1qt. 407403. Condition: New. Listed at 34.99 USD. Applied Biochemists Prevent Plus 32oz. 407403 Clears water and prevents future yellow deposit outbreaks. Used regularly, Prevent Plus will prevent yellow, green, and brown non-metallic stains and deposits and add sparkle to the water. Features: Keeps water crystal clear and prevents deposits year around Prevents yellow, green and brown non-metallic stains and deposits Improves and maintains water clarity Applications: Visible deposits: 1. If visible contaminants/deposits are on the walls or floors, brush the affected areas thoroughly. 2. Add 4 oz. of PREVENT PLUS directly to the pool. 3. Superchlorinate by adding 1/2 lb. of dry chlorine per 10,000 gallons of pool water. Swimming may be resumed a few hours after treatment (when chlorine level is below 3 ppm). Weekly Preventative Treatment: 1. Establish and maintain the normal chlorine level for your pool. 2. Add 3 oz. per 10,000 gallons of water of PREVENT PLUS directly to the pool once a week. Swimming may be resumed immediately after treatment. NET WEIGHT 32oz.