Re: Pic of 1 year old aluminum anode
When mine look like that I replace them. I use zinc anodes so not sure how much better/worse it would be but that looks like mine after 6 months or so. I have been told I am in a "hot" marina but I think it's just my boat which is hot. If you got a year out of it I would call it good, alot less than replacing a pitted prop.