[neoacid]

when i asked a pool place if they had any clear sanitizer that was non-chlorine/non-bromine, the guy said he had one that was hydrogen-peroxide based. I think i remember somebody saying something about H202 being pretty corrosive. However, the pool guy said this wasn't exactly the same as H202, and I'm sure they wouldn't sell hydrogen peroxide for hot tubs. However, does anybody know if this sanitzer would still exhibit the bad properties of H202 on metals? Anybody heard of this stuff?

Since87:
"A one molecule thick layer of corrosion inhibitor probably won't have much impact on cooling because in most cases there is a boundary layer of substantially greater thickness, where the water is flowing very slowly (if at all). Heat has to get through the boundary layer by conduction anyway.

A thicker film buildup (which can occur with WW) is a bigger problem."

You are right. There is laminar flow in the tubes and near the wall there is a layer of water that is almost stationary. If water wetter does protect by building a protective layer, it is probably more than a few molecules thick. Just the fact that you can see the buildup suggests that it is pretty thick (speaking on a molecular level).

I'm being so persistent about this because I would rather have a corrosion inhibitor that doesn't deposit anything on the surfaces (especially these white WW buildups that i've heard of) but instead does its job by staying in solution. This would allow the maximum heat transfer possible and would be mess free instead of requiring extensive cleaning.

This is why I am thinking I should go with the hyperlube (which I can't find in any auto store except online where i have to purchase 4 bottles for $30!) because i haven't heard of any deposits yet. I've already purchased WW, however. I'm hoping before I purchase some hyperlube I can find somebody who used WW in place of hyperlube along with the other ingredients in airspirit's recipe for a coolant mixture so I can verify whether it leaves those white deposits. If it doesn't, then I'm thinking that maybe the deposits were a result of some type of organism that can only be killed by a strong sanitizer or some type of reaction that only the antifreeze protects against.

Thanks for any feedback and suggestions!