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there wont be any difference between the 11l and 25l vessels except the change of resin more often. if you were using the smaller 4or5l vessels then the usage would rise slightly unless you keep the flow from tap down a little. hope that makes sense
If you use 2 DI vessels in series, when the tds from one of them rises above 000, use this one as the first vessel and make sure the second vessel is making 000, when the tds from outlet of first vessel equals tap tds, change resin in this vessel and make this the second vessel. This way you get all of the life out of your resin.Hope this makes sense