The 300 GPD AquaFX will have either TWO 150 GPD RO membranes or THREE 100 GPD RO membranes. If there is only one membrane then it is definitely not 300 GPD. Get the seller to remove the RO membrane(s) and read the side of it which will state the GPD rating. If there are multiple membranes, add the GPD together.
As a side note, not all membranes are made equal. Filmtec is considered industry standard, and is the only brand I buy. Be aware that 100 GPD RO membranes may be as low as 90% rejection (the 75 GPD and 150 GPD memranes are 98%) which means up to 10% of the tap waters' TDS will get through the membrane which means more for the DI resin to take out which means you will go through more DI resin, plus the DI may not be able to remove all the remaining TDS depending what it is that made it through.
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~ Mindy
SPS fanatic.
Last edited by Myka; 11-30-2012 at 11:23 PM.
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