I have anodes on my bow thruster and on my Isotherm
SP fridge through-hulls which I never change -- because they don't waste. I clean them up with a wire brush and that's that.
Now for the very first time, these anodes are worn, but not like the usual anode wasting, which is a clean wearing down with pitting. These anodes are as if chemically corroded -- crumbling into white powder. And a fair amount of marine
growth left over from last summer.
Should I be concerned? The Isotherm
through hulls don't even necessarily need anodes, according to the manual. They are optional; "just in case you might have any concern". And indeed they are made of copper or bronze and not electrically tied to anything; I'm not sure why they would need anodes any more than any other through hull
needs an anode.
Maybe it's because of the fresh water
in the Baltic
last summer? I got as far as Vyborg, where there's already no salt
in the water
Any experience this? The other anodes (prop, shaft, hull) look normal with the normal type of wasting and at the normal rate.