I'm in Edmonton, too, and use tapwater, though perhaps from a different water treatment plant than mexxedm. When treated with Prime, local tapwater is actually pretty good.

When topping up, though, I use store-bought RO mixed with kalk and dripped at night.

used tap water in edmonton for years half the time i was too lazy for prime lol never had anyproblems;)

wait.... to lazy for prime? adding a couple drops is to much work. *slides gun across table*

haha yup lol