Personally I wouldn't bother with RO in Vancouver and just go with DI with a couple of pre-filters, that is what I do and I get roughly 300-400 gallons out of a TWP cartridge. I have never seen the TDS go above 18ppm in my area, and with the new filtration system installed by the GVRD the sediment issue with our water in the winter has more or less been eliminated.
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-=Bryan=-
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