Zeoliitti. ATI Zeolith plus is a micro porous rock of volcanic origin, which has a high content of Clinoptilolite. This product is a completely natural zeolite mixture and contains no chemical additives or colorants. The complex microporous structure of the material gives it high adsorber properties. ATI zeolite plus removes ammonia and ammonium. Its function in nutrient reduction counteracts the formation of algae and enhances brilliant coloring of corals. ATI Zeolith plus is optimally suited for use in saltwater aquariums because it is insoluble in water and will not release toxic substances.