Mercruiser electrolysis / merCathode ?

[cc]

I repowered my searay this past winter with a Merc 250 hp Bravo 1 with full (manifolds as well) fresh water cooling system. This unit is pretty much bullet proof compared to the alpha,s. The Bravo 2 outdrive is beefier, really made for work boat applications, large slow movers. Not much choice in propellors. The Bravo 3 is more efficient than the Bravo 1, owing to the twin counterrotating props. Slightly higher speeds for same horsepower, higher costs also (two props vs. one), and then there is that corrosion problem. As a mechanical engineer, I opted for the Bravo 1. Been around longer, reliable, whole lot less moving parts to go wrong. I subscribe to the KISS theory, "keep it simple stupid". Just my two cents worth.