Edmonton tapwater is treated with chloramine, which is a compound consisting of ammonia and chlorine. Depending on your test kit, you can measure about 1 ppm ammonia from local tapwater.
Many dechlorinators, like Prime and Amquel, are designed to deal with chloramine. They neutralize the chlorine and turn the ammonia into non-toxic ammonium. Again, depending on the test kit, you can measure the treated tapwater for ammonium.
Don't know what sized tank you have, but if it's a nano, you can get away with using RO water bought in 5g blue jugs at most supermarkets. If you have a larger tank, investing in an RO unit would be more economical over the long term.
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