No way we said, after hearing that a radiator cap may prevent hundred of dollars in engine damage. But we were talked into testing it. And we are convinced it works. All water-cooled aluminum and iron engines experience electrolysis-anywhere from 2 to 7 volts. This Charge actually pulls molecules away from aluminum, eating at cylinder heads, engine covers, water pumps, radiator and heater cores. It's a leading cause of mechanical breackdowns. The solution is a magnesium anode built into radiator caps. It draws the current away from aluminum components. The anode is sacrificed to prevent expensive repairs (Your home water heater uses a similar anode, for the same reasons)
Nothing will eliminate all electrolysis voltage in the system, but radiator caps will add years of life to your cooling system. When the anode has been used up, about every year or two, you'll need a new radiator cap. It's an inexpensive alternative to a new water pump, or cylinder head.