Matt I've allready bought a 2nd hand freedom trolley, but thanks anyway as they look just the job for fitting to the trolley, only down side is I would imagine they would need the resin fairly often, but a small price and a 5 min job.
Thanks guys
first off, i would look at your water, if its hard water, you really will be better off going down the RO route, running a small RO into a rain water butt ( or 2 ) and filling your barrels from that
i dont know if you have looked into your water ?? ? as if you are hard water and just DI, it will be expensive
i use a 100 GPD RO into a rain water butt and it works great