wonder if anybody as experienced this before and how you overcome this problem. I have just changed the di vessel setup from before the tank to after the tank. the pump now suck's water direct from tank through twin di vessels then to the real. The amount of pressure build up is fernominal.I have tried auto calibrating the controller and manually adjusting, with no look. It's leaking from any joints it can?? Since changing the setup my resin went from 002ppm to 123ppm in one day, 500 litres, Please can anyone help?