Typical % recovery is limited to 70% to 80% of the total feed water volume. This limit is due to osmotic pressure, limited solubility of the ions and dissolved solids, and silica left behind in the reject water.

In the example above, the 100 ltr/hr of feed-water has produced 75 ltr/hr of permeate and 25% of concentrated reject water. Hence, we have 75% recovery and 25% reject.