since i switched ive been buying my resin from peter in 20 quid batches  i am now using a lot more than i was so need to buy in bulk..whats the best stuff and where from? (peter if you sell in larger quantaties let me know)  thanks

cheers frankie lad 

i have found that in my case having the water on a slow as possible the resin last longer

If your only using a smallish di vessel, then it must come thru it very slowly.....at a trickle, otherwise it wont have time to purify properly and will come out at ppm 10 or much higher. Larger di vessels, say 11 litre or above, then one litre per minute is ample for pure water to come out the outlet. Tap pressure is way too high for water to turn pure thru a di vessel of any size.