From the Star Tron Website:
To assist boaters, Star Brite has introduced Star Tron, a revolutionary fuel additive based on enzyme technology that can prevent these water-related fuel problems. water can wind up in your gas or diesel fuel as a result of condensation in the tank. Because water is heavier than fuel, it sinks to the bottom of the tank and forms a distinct water layer. The fuel pick-up tube is located at the bottom of the tank so, once this happens, water is supplied to your fuel pump. Obviously the engine can not burn water; soon it starts to sputter and eventually stops running. Additionally, water is corrosive so it deteriorates tank walls and metals in the fuel delivery system.
The enzymes in Startron prevent the water molecules that are in fuel from combining and forming a distinct water layer. Water is reduced to sub-micron size particles that cannot cause corrosion and are safely burned during normal combustion. The enzyme package in Star Tron disperses water derived from normal condensation into microscopic clusters, and allows the water to pass through the fuel system and engine harmlessly, preventing the buildup on the tank bottom that can contribute to poor performance, fuel gelling and corrosion. This de-watering effect prevents potential phase separation. If large amounts of water are already present it will be de-emulsified and drop out of the body of the fuel, improving overall fuel performance. Over a period of time, with fresh gas loads treated with Star Tron, even large accumulations of water will be totally eliminated. Star Tron can also counter the effects of lost octane, greatly improving the combustion performance of E-10 fuel that has had water contamination.
Star Tron can also prevent filter plugging from old gum and varnish. The enzymes help break down the dislodged sludge and other deposits into sub-micron-sized particles that usually pass through the fuel filter and are burned away as part of the combustion process. Tank deposits that would cause gelling are solubilized so that fuel flows uninterrupted through the filters.
Star Brite Star tron is available in 8 fl. oz, 16 fl. oz, 32 fl. oz.
Seems to be very similar to Sta-Bil marine IMO