The velocity domain is a suitable place to separate reverberations associated with the water layer. Using windows to separate primaries and multiples fails to suppress low-order reverberations and degrades primary reflections. Better results can be achieved with the use of a prediction-error operator to construct a primaries-free window function. Some advantages of this method are the substantial attenuation of multiples even at the near-offset traces, preservation of the amplitude and phase of the primaries, preservation of weak primary events with stacking velocities similar to the multiples, and the complete automatization of the process.