Any Coastal Reefers using natural sea water?

[Scavenger]

Well as I research and plan my first reef, I seem to come up with more and more questions. Here's the latest. Does anyone use natural seawater in their reef? I was curious if I could collect some (very easily where I am), heat and age it for a couple of days and use it for water changes. I was thinking that this might reduce the need for dosing the tank. Anyone tried this or have any thoughts on it?