PRIME is a complete and concentrated conditioner for both freshwater and saltwater. Prime removes chlorine, chloramine and ammonia. Ammonia into a safe and nontoxic to be rapidly degraded by the biological filter of the aquarium. Prime can be used during the cycling of the aquarium to reduce the toxicity of ammonia and nitrite. Detoxifies nitrite and nitrate, allowing more efficient biological filter removing them. Also detoxifies heavy metals found in tap water at concentrations typical. Prime also promotes the production and regeneration of natural protective mucus of fish. It is an acid and does not impact the pH of the aquarium. Use this product when you start the aquarium and how much water is added or changed. A single 100ml bottle is 4000 liters of tap water, saving much more than using any other product on the market.