Safely maintain water quality in your boat or RV with Star brite Aqua Water Treatment & Freshener. Its biodegradable formula prevents fresh water from taking on a chlorine, sulphur, plastic, or metal odor or taste. Aqua Water Treatment & Freshener can be used as often as needed to ensure quality of bathing and drinking water and ice. One fluid ounce treats up to 20 gallons of water. 16 fl. oz.