No, it doesn't make sense. The dissolved organics are not solely at the surface of the water, they're in solution just as with saltwater. Alkaline water is not sticky, the molecular charge of the water and nutrients at the air/water interface (hydrophilic/hydrophobic properties) determines what "sticks" and what doesn't. Fortunately for us in SW, the contents of the SW act as a better surfactant than is (generally) available in FW. Essentially SW is "thicker", if that makes any sense.
