Coleus - i can't remember where i read this (might have been the spectrapure site) but maybe someone else can confirm this;
the 100+ gpd membranes have a lower rejection rate (~80-85%) while the 50-75gpd membranes average 95-98%. I would assume this means the DI resin in your system has to process more "after RO" TDS than the smaller systems so you will extinguish your DI resin faster than others.
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