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. AQUARIAN TAP WATER SAFE Aquarium Water Conditioner instantly removes chlorine and neutralizes chloramines. It also detoxifies heavy metals in tap water. Use during tank set up and with every water changed. Care for your fish inside and out. AQUARIAN is the leading fish food in the UK. Keep your fish healthy, happy and colourful with fish food that contains appropriate levels of nutrients and use conditioner that keeps water safe for your pet fish such as goldfish, tetra, betta, angelfish. Care for your fish inside & out. AQUARIAN, RECOMMENDED BY TOP AQUARISTS.™