No problem. Most systems offered for our use are very much the same, but by knowing a little more about your source water you could save yourself one or more stages of filtration. It would help if a few folks from Calgary would provide additional input to help you make a choice. The TDS for folks in Vancouver is so low out of the tap, they could probably run a DI stage only and forego the RO section altogether. My source TDS is in the 210 to 220 range and the 75 gpd RO stage takes that down to 1 or even 0 in the winter with colder water, the DI stage takes care of the residual TDS.
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