saw the problem begin to develop in my engine. I went to my part store{carquest]. they found me a radiator cap, that fit my car, with a zinc attached to it, it dangled an inch or two in the water. Electrolysis will attack the zinc, and not your engine. when the zinc is starting to get eaten up, simply get another radiator cap. Salt water boats have used this tech for years to prevent the problem. It simply works, and no mess, no fuss.