Maintain odorless and tasteless drinking water. West Marine's Water Treatment and Freshener maintains drinking water quality in boats and RVs. Prevents foul-tasting or smelling potable water. Can be used as often as needed to ensure quality of bathing and drinking water as well as ice. Prevents water from taking on chlorine, Sulphur, plastic or metal odor or taste. Key Features Treats freshwater system to prevent unwanted odors or tastes Non-toxic can be used as frequently as needed Bio-degradable formulaIdeal for boat and RV freshwater systems1 fluid ounce treats 20 gallons of water