We recommend that a fuel filtration cycle be set up to circulate 25% of the fuel tank's content every week. This schedule would allow some time for suspended contaminants and water to settle to the bottom of the tank, where they can get picked up by subsequent filtration events. Also important, a fuel maintenance system should be selected with a fuel circulation pump of sufficient flow capacity to complete a cycle within an 8-hour period. This would allow for a filtration event to be supervised from start to finish by an employee within a single work shift.