Tetra Aquasafe creates a safe, nature-like water for fish and plants. Removes chlorine and chloramines Neutralizes heavy metals Supports fish's protective mucus layers Adds Iodine, Magnesium, Vitamin B and other elements for health & vitality Tap water should always be treated before it is added to your aquarium, 5 ml of AquaSafe Aquarium Water Conditioner should be added for every 10 liters of tap water. AquaSafe Aquarium Water Conditioner is suitable for tropical, coldwater and marine aquariums