Thanks for the replys, so do you think its better to fill the tank up with tap water first?
yes, because the slower the water can travel through the di vessel at point of use the more effective it will be at cleaning the water and lasting longer.
Just thinking maybe you could put a couple of prefilters in before the tank ? I know its a must for protecting ro membranes but if its of any benefit for just di I am unsure ?
maybe someone else on here could advise on that.