RO reverse osmosis water purifier water filter 5-stage RO system with transformer, booster pump, auto shut-off valve. RO reverse osmosis water purifier water filterWATER FITLER CARTRIDGES1. (Stage 1) 5 Micron Sediment water Filter :With only five micron rating. It is effective in removing dirt, rust and sand particles.2. (Stage 2) Granular Activated Carbon water Filter:It takes out 99% of the ...