I can make no predictions, but think of it this way. I had my 1200 go to 8% 2 years ago so easy. Last year I made it do twice as much sap and made it take it to 12 % one pass. That was with 2 towers. You have 4 towers. I am adding a third tower now and plan on taking it straight to 16%. With 4 towers you will have it made in the shade. You are going to find that you are way overpowered in the RO field.