It would actually be worse than Al.
But you can make your block out of Al and coat everything that water contacts with a clear coat of laquer paint....unless of coarse you plan on using a $hitload of anti corrosive chemicals in yur water, then it should last a long time and work quite well.
Copper is a PITA to mill..next time practice on Al before you start cutting on a nice peice of copper.(I learned the hard way)
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