I really like my AquaFX 4 stage RO/DI. Good quality design. Mine is 50 gpd, and I think it's a bit slow for a 90 gallon tank (it was a great choice for the 33 gallon tank I had when I bought the RO/DI). I'm getting close to needing to replace the RO membrane so I will upgrade to a 150 gpd membrane and flow restrictor. Be aware that 100 gpd membranes are not as efficient as 50 or 150 gpd membranes, and won't lower your TDS as much as the others which in turn will wear out your DI resin quicker.
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~ Mindy
SPS fanatic.
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12-12-2009, 03:02 AM
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