Duke,
Am using RO from a Kent unit purchased from J&L. Would never use tapwater in my reefs, though I know of some locals who do.
FWIW, here's Epcor's water quality reports:
http://www.epcor.ca/EPCOR+Companies/EPCOR+Water+Services/Water+Quality/Water+Quality+Reports/2003+Water+Quality+Summary+(Monthly).htm
Geez, that's some address
