Each stage is comprised of a unique proprietary formula of infused microstructure filtration media designed to target a specific group of contaminants. Contains no resins or beads. Engineered for unsurpassed performance and maximum contaminant reduction. Independent lab reports show the ProMax reduces/removes a broad range of 200 + contaminants including VOC’s, lead, fluoride, heavy metals, pesticides, SVC’s, disinfectants, inorganic non-metallics, herbicides, pharmaceuticals, PFOA, PFOS and micro-organisms. ProMax filter technology is available on select Propur products including Propur Shower Filter, Countertop and In-line refrigerator.