Well guy says "Dead Short", Steel Drop Pipe has weird pock marks on it

If you search online, some companies sell nothing but anodes and can advise on a solution and method of application.

I have not done it, but it certainly seems to makes sense as a boat wouldnt float with tons of them.

http://en.wikipedia.org/wiki/Galvanic_anode

http://www.waterheaterrescue.com/pages/WHRpages/English/Longevity/water-heater-anodes.html

http://www.deepblueyachtsupply.com/zinc-anodes/shaft-zincs-inch

Magnesium is likely best, and they can also be used to preserve steel well casing.