718655fb_at_Conundrum__Mackinac_Center___3
[0] Heat [1] Use of engine cooling system to raise temperature of ballast water. [2] No chemical byproducts. Effective with large organisms such as fish. [3] 
Less effective against microorganisms. Limited by engine size. Potential for tank corrosion. Dangerous for use on chemical tankers.
Great Lakes, Great Conundrum [Mackinac Center]
3