One of our double pass systems is now running with perfect results. As shown in the screen shots, the feed conductivity is 297.06 µs/cm. after the water exits the Biopuremax pretreatment with ESR and HOD, it keeps flowing to the first pass through the RO membranes. the permeate conductivity drops to 9.91 µs/cm, and after the second pass to 2.62 µs/cm.
The final “polish” from the CDI, decreases the conductivity to 0.08 µs/cm, well below the needed 1.3 µs/cm.