Danny. How much did you fill it up? Needs to be a couple of inch,s from the top. Also as above says check you have the water going in/out into the di vessel. You will see it marked on the top of it mate. Also with kind of tds you will go through the resin fairly quick so may be worth getting either twin di or a RO system. I'm surprised your tap tds is that high mate as mine is only 70