Filtering medium blend made with 50% super-activated carbon (CLAROCAR) and 50% best selected zeolite (ZEOLITE) for fresh and marine water aquarium. Activated carbon absorbs the polluting pigments produced by the decomposition of many substances in aquarium, such as food waste, dead algae and plants. Zeolite absorbs and neutralizes nitrites, nitrates, silicates and ammonia, keeping the aquarium water crystal clear. On the basis of very positive tests made at their own laboratories, PRODAC guarantee excellent results by using CARBO ZEO as filtering medium.