I think a lot depends on the bioload. If it is on the high side I recommend getting an RO unit. Calgary water is very good for tap water but there are still some phosphates that probably get through in my opinion. Also we have 2 different water supplies depending on what part of town you are in and they may be inconsistent. I used tap water for a long time but with my large bioload going to RO has created an improvement.
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Greg
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