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05-27-2011, 12:01 PM
Left to right his is sediment of prefilter, carbon block, useless second carbon block, RO membrane on top then DI filter on the right.
Two carbons are not needed if you use a good prefilter and 0.5 or 0.6 micron carbon block. you could easily eliminate the second unneeded carbon or better yet replumb it into a second DI chamber for the most bang for your buck.
Forget the word "stages" even exist and concentrate on what the stages contain and not how many of them there are. A good reef quality system consists or 4 "stages". A 1 micron or less prefilter and absolute rated is better than nominal rated with 0.5 microns being preferred, a single 0.6 micron 20,000 gallon carbon block, a 75 GPD
Dow or 100 GPD
GE RO membrane and a vertical 20 oz refillable DI. Thats all you need unless you have special conditions where maybe a dual DI might be warranted such as chloramines or CO2.
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