Marine Engine Fresh Water Flushing System, without correct maintenance the cooling system within your marine engine can quickly block with salt deposits and if left can cause serious damage. Not only will salt corrosion eat away the inside of your engine but it also restricts the water flow resulting in ineffective heat exchange that can lead to serious overheating issues. the best way to keep your marine engine cooling system maintenance to a minimum, is to flush your engines saltwater system after each use with a fresh water flushing system,