Reverse Osmosis filters: a multi-stage filtration of water is offered by a Reverse Osmosis (RO) system offers by combining particle filtration and active carbon. Through an outlet pipe, the impurities collected are then flushed out. The taste of water is improved by a brackish water RO system. As at times some bacteria can get through the filter due to holes in the filter, it is tough to say that the water will be 100 percent safe.