DI only is fine for a smaller tank (i.e. <50 gallons or so) in the GVRD because our TDS is so freaking low (~10!).
Larger tanks tend to require more water than DI-only units like the AP Tapwater Filter can easily produce. I used an AP Tapwater Filter for several years on my 46-gallon.
However, if you plan on sticking to this hobby in the long run an investment in a full RO/DI unit is a good idea.
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