Originally Posted by twistedtree
Another maintenance item that I forgot to mention is changing zincs on the keel cooler. They didn't last very long on our 60, and every 4-6 months had to be replaced. Other zincs were good for a year or even two depending on the water. In the PNW they lasted a lot longer than Mexico. My guess is because of the salinity level, but I don't really know.
Walters don't require cleaning like that. The tubes are separated by a couple of inches and get hot enough nothing really sticks to them. Zincs, yes, every six months or so.