DieselPure™ filters are specifically designed to manage entrained and emulsified water in ULSD fuel and biodiesel blends.
In January 2010, EPA regulations came into effect that drastically removed sulfur (a natural lubricant for the fuel) from the refining process of diesel. Additives to compensate for the sulfur were then required.
These additives, including biodiesel, turned out to be a surfactant. Surfactants stabilize water in the fuel, allowing the water to bind with the fuel so tenaciously, that traditional fuel filters proved ineffective.