WATERCO FILTER MEDIA ZEO PLUSDual Filtration ZeoPlus provides excellent mechanical filtration of suspended particles. In addition to trapping the larger particulates between the grains of the ZeoPlus (similar to the filtration mechanism of sand), ZeoPlus is also capable of filtering the smaller particulates by catching them within its micro porous structure and surface irregularities. It is this dual filtration action that helps ZeoPlus achieves superior water clarity. Ammonia