On Sat, 25 Aug 2007 11:49:16 -0400, Neon John wrote:

..,.the aluminum can be completely protected from corrosion by fresh water
using cathodic protection. ...the magnesium anode screwed into the tank...

Aren't there also some active systems that do the same thing using electric
power instead of relying on cathodic action to provide the low voltage
differential? Of course they would stop working when the power went out, but
hopefully the amount of damage caused during the short power failure would not
amount to much.


Robert Scott
Ypsilanti, Michigan