American/European style RO machine without pump, toghther with 4 ... : 5micron PPF Cartridge which filter sand, mud, rust, sediment, etc in water.Stage 2: Granular Activated Carbon Cartridge ... which removes bad smell and filter organic sediment, chlorine etc in water.Stage 3: Block Activated ... pump,reverse osmosis) RO style without pump sediment filters(RO,ro purifier without pump)