Technically if you measure your tap water with a TDS then you will know if you absolutely need an RO/DI. apparently Vancouver comes in with a measure of between 2-14ppm. If it was always 2 then I would not bother with an RO machine. The downside of course is that if you get massive rain (like we have recently) it can affect the measure. As an example Whistler's water comes in at about 30ppm (Lots of silicate I guess since it is glacial fed). But recently it has been more like 70ppm!
I now use an RO/DI machine but for my first year in the hobby used tap water with no ill effects (Also no corals, just fish at that time).
Best,
Rob
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