Aluminum Sacrificial Anodes for "brackish" water???

[T37Chef]

I was reading a blurb in a sailing magazine about anodes, and they mention using aluminum anodes in brackish water?

This is new news to me, is/has anyone used the aluminum anodes and what are your comments.

I know that whatever you use, they should all be the same so it may be a mute point for me as I have a zinc for the prop that is only sold in zinc as far as I know.



Thanks

[mitiempo]

I have heard zinc for salt, aluminum for brackish and magnesium for fresh water.
Brian