Camco Marine - Water Freshener Replaces P/n 117-40206 Rvx - 16 oz. - 40206. Camco TastePURE Drinking Water Freshener helps to eliminate algae and slime from your drinking water tank. Just 1 ounce for every 20 gallons of water helps remove bad smells and tastes.. Features:. Size - 16 oz. Bottle. Prevents algae and slime buildup from RV drinking water tanks. Just 1 oz. helps remove bad smells and taste from 20 gallons of water. Keeps stored fresh water tasting and odor free. Easy to use