Star Brite® Aqua Water Shock 16 oz. Instantly removes bad taste or smells from boat or RV s potable water. - Ideal for use after seasonal storage to freshen water tanks. - Removes chlorine, sulphur, plastic or metal odor and taste. - Provides long-lasting effect, even in extreme temperatures. - 1 fluid ounce treats 10 gallons of water - NOTE: To maintain water quality year-round, use Star brite Aqua Water Treatment & Freshener.