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OK first of all you do not need both pumps if they are both connected drop the permeate off the system. What exactly is your storage tank?
With your tap TDS at 120-130 and a your old Filmtec 75 GPD membrane your post RO reading should be 2-4 so 20 is not right. An RO bypass will work for flushing that first burst which only lasts a minute or less.
Jim
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