It is used for household based on RO technology,5 stage filtration,the output water can be drinken directly 50,75,100GPD usually The different stages inside a residential Reverse Osmosis systemDomestic and commercial reverse osmosis water treatment system in general, is actually refering to a series ofcarefully selected water treatment methods used in combinations to achieve the best possible quality in supplywater. The diagram on the left shows the general schematic of a typical 5 stage RO water system.Stage 1The systems begins with normally a 1 to 5 micron sediment filters to hold back any large particulates includinglarge iron slits, dust, turbidity. This will prevent any deposition of large particles onto the ultra fine ROmembranes which typically in the order of 1 to 100 angstrom (1 angstrom = 1/10,000 micron or1/10,000,000,000 meter of 1/10trillionth meter, this compare to human hair thickness with average diameter ofapproximately 750,000 angstrom or 75 micron).Stage 2The Granular Carbon filter is then use to pick up about 90 to 95% of all the organic particles and remove themajority of chlorine in the water stream. Under proper maintenance, the carbon filter will help to maintain theefficiency of RO system for longer service life.Stage 3The Block Carbon filter is then use to pick up about 90 to 95% of all the organic particles and remove themajority of chlorine in the water stream. The carbon filter can completely remove bad smell in water. Underproper maintenance, the carbon filter will help to maintain the efficiency of RO system for longer service life.Stage 4Then the fourth step is the use of RO which is the heart of the system. The fine membrane as explain by previousarticle regarding the Reverse Osmosis. It acts as surface filter with fine enough mesh to pass only a smallamount of minerals and water molecules. Any long chain organic compound, including micro-organisms and alsoartificial compounds such as pesticide and weedicide will be screen out. Because of the ultra fine mesh size ofthe membrane, it will also block all harmful virus and other micro-organisms which may pass through in case ofalternative filtration technology.   Storage TankBecause of the high pressure drop of the Reverse Osmosis process in order to filter the water particles, theclean water stream has very slow flow rate and a temporary water reservoir tank is used to buffer the flow whenno clean water is draw from the system. The clean water is collected in the tank when the system is in idle statusand also the tank will act as a pressure buffer to smooth out any pressure changes between the two side ofreverse osmosis membrane which will extend its life. A automatic shut off valve (whether it is a electronic ormechanical) is then used to shut off water supply to the RO system when the water tank is full.Stage5There are sometimes small odors in the clean water which is a result of the interior finishing of the water tankand inner lining of the tubing. Thus a final post carbon filter is normally added as a final polish filter to removesuch odors or taste and to give the great taste typical of spring water.It is common for the sediment and the first carbon pre-filter to plug up and efficiency reduced by the end ofservice life cycle and the second carbon filter has thus little effect to the overall performance of the system.While adding a second activated carbon pre-filter to the system has no ill effect to the drinking water quality, theuse of such system may be subject to the water source conditions including chlorine concentration, organiccontent (such as the case of having a no-pretreat surface water source), etc. and thus it is best to talk to yourPerfect Life Water specialty agent for recommendation first.

100GPD RO water purifier