Good water quality is the key to a healthy, beautiful aquarium. Tap water contains chemicals, such as chlorine and chloramines, which make water safe for drinking, are highly toxic to fish. High levels of these chemicals destroy fish gill tissue, preventing the uptake of oxygen which can lead to fish death. Even low levels irritate delicate fish tissue. Tap water must be treated before adding fish to make sure fish remain healthy. API TAP WATER CONDITIONER Aquarium Water Conditioner instantly removes chlorine and neutralizes chloramines. It also detoxifies heavy metals in tap water. The formula of API TAP WATER CONDITIONER incredibly concentrated. You only need up to 3 ml to treat 10 gallons of water. It's safe for all aquatic and can be used in both fresh and salt water. Use during aquarium set up, water changes and adding fish. With API aquarium products, its easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because were dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too. Ingredients Instantly Detoxifies Heavy Metals, Removes Chlorine, And Breaks Chloramine Bonds. Directions Use when setting up an aquarium, and when adding or changing water. Using dosing cap on bottle, add 1 ml for each 20 gallons (76 L) of aquarium water to remove chlorine and heavy metals. To detoxify chloramines, add 5 ml for each 30 gallons (114 L) of aquarium water. Tip: heavy metals, such as copper, lead, and zinc, can be found in most tap water supplies. These metals are toxic to tropical fish. So treat the aquarium when adding tap water.