An apparatus, system, and method are disclosed for multistage water
separation. A first separation layer separates water droplets from a fuel
flow by repelling the first water droplets. A coalescing layer may
coalesce fine water droplets in the fuel flow. In one embodiment, a
centrifugal separator directs the fuel flow tangentially to a filter wall
and the centrifugal force of the fuel flow directed tangentially along
the filter wall biases water droplets from the fuel flow. A second
separation layer separates second water droplets from the fuel flow.