Currently renting DI tanks from the big water folks over here (culligan) and it cost $120 for approx 1100 gallons. Once a month or so they bring me a new set of tanks. You all just replace your resin with new resin instead of recharging the resin. I have done a fast web search for resin suppliers over here with limited success. Anyone else have an idea where a yank can find resin besides the UK...I would assume that shipping alone would be unholy.