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Old 01/10/2008, 03:37 PM
bnmir bnmir is offline
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Join Date: Oct 2004
Location: Pittsburgh, PA
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It seems to bme that the waste from unit 1 would have considerably higher tds than your raw input water, so the reject rate from unit 2 is likely to be extremely high.
The added backpressure on the output of unit 1 (caused by unit 2) will have a detrimental effect on the output of the 1st unit.
You might be able to overcome this with a permeate pump, though.