... pump, toghther with 4.0G plastic tank (RO,ro purifier,reverse osmosis) Features:Stage 1: 5micron PPF Cartridge which filter sand, mud ... Carbon Cartridge which complete removes bad smell in water and filter organic chemical pollution.Stage 4: RO membrane which remove ... water, Using in-line seal construction to separate from air, then prevent from second-hand pollution. (RO,ro purifier,reverse osmosis)