Tony,
This is the first time I am going to have to disagree with you
You can pump through di vessel at full mains pressure provided your di vessel is large enough. But your TDS wont stay at 000 for long, if you slow the rate down then it goes back down to 000. To fill a 500l tank it takes me around 15-20 mins.
But then again it is up to each persons option how they fill their tank and what is best for them.
WHAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAATT! I'M WRONG?
Fair enough doug, i've tried it with a 11ltr vessel & had to turn the flow down quite a bit, mind you, that was in the dark old days of purolite!
My tap pressure is massive though, i've never come across another domestic mains supply with such huge pressure before.
But my point is still valid with topping up mid-round if DI's are in van
tony