Juwel compact carbon filter media for bioflow 3.0 filters (Rio 125, 180, 240, vision 180, trigon 190, lido 120 aquariums). cleans the water of all chemical impurities by absorbing them in its active carbon. Change monthly. Contains 2 carbon sponges. There is a myriad of parts, accessories, valves, nets, cleaning products, water products and treatments to name a few that are available for your tank. All these items are designed to make owning and the upkeep of a tank easier for the average fish enthusiast. Once you have found the right item be sure that it is correct for your set up and that it suits, your fish and tank, bearing in mind the size of your tank and the type of fish You own. There is a myriad of parts, accessories, valves, nets, cleaning products, water products and treatments to name a few that are available for your tank. All these items are designed to make owning and the upkeep of a tank easier for the average fish enthusiast. Once you have found the right item be sure that it is correct for your set up and that it suits, your fish and tank, bearing in mind the size of your tank and the type of fish You own.