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As many have mentioned above, this is just a ion exchange water filtration system, used by window cleaners up and down the land.
I would buy one of these http://www.windowcleaning-supplies.com/product/69lt-di-resin-vessel-0119832.html and one of these http://www.windowcleaning-supplies.com/product/10lt-resin-in-a-bucket-01196210U.html
More or less the same thing for the same price by the looks of things, Zep? Maybe a few quid less.
edit - the resin is quite a bit less expensive via your link. I assume it's the same stuff, near as dammit?