Apparatus comprising a water tank (1) and an a discharge pipe (2), wherein the discharge pipe (2) is equipped with a pressure limiting unit (3) consisting of a horizontal pipe (7) having a 10-50 cm high vertical tube bend (8) and a control device (10), whereby the pipe (7) is mounted rotatable around its horizontal axis and the vertical tube bend (8) has one segment conducting upward and another segment conducting downward, in addition to a segment (11, 12, 13) of said pipe (7) that connects said two other segments.
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