The GloFish Water Conditioner makes tap water safe for your fish. With a liquid volume of 59 milliliters and an item weight of 0.19 pounds, this water conditioner is perfect for use when setting up a new aquarium or reducing stress on your fish from water changes or evaporation replacements. The GloFish Water Conditioner makes tap water safe for your fish and promotes health by removing harmful chlorine, chloramines and heavy metals found in the water.