Thanks for the help guys. Looking further into that Costco link Macky provided I came across this interesting fact.
"While standard reverse osmosis systems waste 15 or more litres (4 gallons) per every 4 litres (1 gallon) produced. The new patented "Zero Waste" reverse osmosis system wastes no water. "
http://www.costco.ca/Browse/Product....835&lang=en-CA
Is this correct, how do standard RO units waste water? Surrey residents are metered for water use so wasting four gallons to produce one seems costly and not very "green".