I just found out that Saskatoon uses chloramine. I don't have chloramine filters in my RO/DI unit. This makes me wonder about some of the issues I've had with my reef tanks...
For those that don't know, chloramine is a chemical used by water treatment facilities. Some facilities choose to use chloramine as opposed to chlorine. In order to remove chloramine you have to break the bind of the chlorine and ammonia, then both need to be removed. Chloramine will not off-gas like chlorine will so adding an airstone to a bucket of water will not remove it. Typical carbon also will not remove chloramine.
If your water source contains chloramine you need chloramine-specific filters in your RO/DI unit before the RO membrane. Chloramine should damage the RO membrane (and irritate/harm the reef inhabitants), although my RO membrane is 18 months old now and I don't have any issues with it.
I can't wait to get the chloramine-specific filters in from BRS and do a big waterchange!
Please either send an email in to your water works division or check your local city website, you should double check. Thanks to one of our local reefers who tipped me off on this!
EDIT: Please check out Buckeye Field Supply's post on Page 5, post #43 for a professional answer to chloramines. Thanks Russ!