This helped me increase my water consumption from 100 gallons a day to 150 gallons a day. And my effluent ratio went down too, it has better efficiency than express membranes at lower cost. And the filtration rejection rate is the same as the express membrane, they are made of the same material as the composite film. After adding the second stage DI I have almost 0 tds of water. Still not perfect for my needs so I may add another DI and/or add a second RO cone to increase GPD and bring TDS down to zero. Right now my water has gone from 380ppm to 5ppm. I have a whole house filter that doesn't remove TDS, but it helps extend the life of the reverse osmosis membrane and pre-filters, chlorine, chloramines or particles larger than 0.35 microns don't get into the reverse osmosis.
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