Bloggers Wanted
We're looking for people to help with the main blog. If you are consistent, knowledgeable and you're into it, please drop me a note.
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Housseinafghani
 Expert Boarder
Posts: 116 
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Aquafx dolphin 3 stage... anyone heard / used this system?
and Aquafx barracuda 4 stage... anyone heard / used this system?
is 3 stages enough?
thanx regards
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davidhw
Expert Boarder
Posts: 133
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All depends on how bad your tap water is. For an example, NYC tap has a PO4 range of 1~2ppm. W/o the DI, I still get a 0.25ppm PO4 reading after RO filtration. I need that 4th DI stage to achieve 0.0 ppm reading per Salifert.
In general, three stage will not filter out all of the PO4 and silica, so it is much better to go with a 4 stage unit.
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Javid
Expert Boarder
Posts: 120
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be careful in calling 4 stage unit a DI all together I have 7 stages. sediment prefilter.. preinstalled on my house 5 stage RO.(drinking water) One add on DI
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Mathiasll
Expert Boarder
Posts: 120
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Most of the 4 stage RO/DIs that is good enough for reefkeeping that I know of has this layout ... 1. Sediment, 2. Carbon, 3. RO, 4. DI
5, 6, 7 stages have different layouts compared to 4 stage units. I know many 7 stage that has 3 DIs at the end. So you know the 4th isnt DI.
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filarete
 Expert Boarder
Posts: 110
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All true, but I think Kyle was pointing out that if you go to HD or Lowes to get an RO/DI. the 4th stage is usually not a DI.. therefore be careful.. Rod Buehler
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VGR79
Expert Boarder
Posts: 102
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I could be wrong, but I dont recall seeing a filter sold at HD or Sears has DI, so the naming of RO/DI should automatically remove those filters from the selection.
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