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Although not as economical as an RO have you thought about using two DI vessels? Once the first one starts to rise in TDS, instead of throwing it away you use it to "pre-filter" the second vessel which has new resin in it. Also known as a "twin DI system".Doing this & using Tulsion MB115 resin will prolong your resin life considerably!
are you on a water meter if not try a merlin at optimin set upshud produce 720gpdjust elongate the waste pipe n purepipe