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Old 05-14-2008, 03:39 PM   #11
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You pay more for the brand name but the filters are standard and made by the same 3rd party company, so all that "brand name" is getting you is the tubing and the plastic housing. The more GPD the less you'll have to change the filters... The cheaper, though with any you should run it from time to time just to keep everything 'fresh'
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Old 05-14-2008, 08:29 PM   #12
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You should look for the Dow Filmtec Membrane and a 75GPD unit. The 100gpd does not have as good a rejection rate as the 75 (90% vs. 98%). AirWaterIce (where I got my unit) recommends using a 10 micron sediment filter followed by a 5 micron carbon, followed by a 1 micron carbon. The system is a logical placement of filters. The sediment filters take out all the big stuff and need to be replaced more often than the carbons. The DI unit comes in last, after the RO membrane.
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