... pump, toghther with 4.0G plastic tank (RO,ro purifier,reverse osmosis) Features:Stage 1: 5micron PPF Cartridge which filter sand, mud ... in water and filter organic chemical pollution.Stage 4: RO membrane which remove bacteria, Virus, Corpuscule, other solute and chemical ... , then prevent from second-hand pollution. (RO,ro purifier,reverse osmosis) American type purifier with manual flush(RO,ro purifier ...