The invention relates to a cascade washing system (1) for treating a belt-shaped flat product, having at least two washing stages (2, 3, 4, 5, 6) arranged in series with one another with respect to a conveying direction (F) of the flat product through the cascade washing system (1), each of which Rinsing stage (2, 3, 4, 5, 6) has a rinsing basin (7) from which a rinsing liquid for treating the flat product in the respective rinsing stage (2, 3, 4, 5, 6) can be taken. In order to provide a more compact cascade washing system (1), each washing stage (2, 3, 4, 5, 6) has at least one washing liquid pump (8) arranged at least partially in its washing basin (7).
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