Product Details : Substrate designed for the ' use in aquariums or planted with caridine or with fish that require a low pH (eg Discus ) . Composed of high-quality substances that help maintain a stable level of pH , kh and to reduce the levels of ammonium / ammonia. It does not need to be rinsed perima of ' use and helps make the ' most crystal clear water . helps to keep the pH value around 5.5 lowers kh 2 points helps to lower the levels of ammonia and ammonium The product , once inserted into the aquarium , gives life to a bacterial flora that is established in the substrate of your aquarium ; flora that helps to control the pH level of kh and NH3/NH4 ; additionally equipped with a high power absorbent .