A septic water distribution pipe comprising an interior chamber and an entry port, an outer surface and an inner surface formed by the interior chamber, the septic water distribution pipe is during use adapted to be mounted above a treatment bed and to receive septic water via the entry port and to aerate and distribute the septic water onto the treatment bed, characterized in that the septic water distribution pipe is configured with a side arranged to during use face the treatment bed and with a vertical axis V during use arranged to be perpendicular to regards to the upper surface of the treatment bed, and a horizontal axis H perpendicular to the vertical symmetry axis V, and in that the septic water distribution pipe comprises; at least one pair of over-flow holes positioned at a second position along the longitudinal axis C of the septic water distribution pipe, each of the over-flow holes extending from the outer surface to the inner surface of the septic water distribution pipe and arranged so that in a cross-section B at the second position of the septic water distribution pipe, the pair of over-flow holes each are at approximately 90 ± 10° in respect to and on each side of the vertical axis V; at least a pair of aeration holes positioned at a first position along the longitudinal axis C of the septic water distribution pipe, each of the aeration holes extending from the outer surface to the inner surface of the septic water distribution pipe and arranged so that in a cross-section A at the first position of the septic water distribution pipe, the pair of aeration holes are positioned at 45 ± 10° and at 135 ± 10°, respectively, in respect to the horizontal axis H at the half of the septic water distribution pipe that during use is arranged to be facing away from the treatment bed; and at least a pair of drainage holes positioned at the first position along the longitudinal axis C of the septic water distribution pipe, each of the drainage holes extending from the outer surface to the inner surface of the septic water distribution pipe and arranged so that in a cross-section A at the first position of the septic water distribution pipe, the pair of drainage holes are positioned at 45 ± 10° and at 135 ± 10°, respectively, in respect to the horizontal axis H at the half of the septic water distribution pipe that during use is arranged to be facing the treatment bed. at least one pair of over-flow holes positioned at a second position along the longitudinal axis C of the septic water distribution pipe, each of the over-flow holes extending from the outer surface to the inner surface of the septic water distribution pipe and arranged so that in a cross-section B at the second position of the septic water distribution pipe, the pair of over-flow holes each are at approximately 90 ± 10° in respect to and on each side of the vertical axis V; at least a pair of aeration holes positioned at a first position along the longitudinal axis C of the septic water distribution pipe, each of the aeration holes extending from the outer surface to the inner surface of the septic water distribution pipe and arranged so that in a cross-section A at the first position of the septic water distribution pipe, the pair of aeration holes are positioned at 45 ± 10° and at 135 ± 10°, respectively, in respect to the horizontal axis H at the half of the septic water distribution pipe that during use is arranged to be facing away from the treatment bed; and at least a pair of drainage holes positioned at the first position along the longitudinal axis C of the septic water distribution pipe, each of the drainage holes extending from the outer surface to the inner surface of the septic water distribution pipe and arranged so that in a cross-section A at the first position of the septic water distribution pipe, the pair of drainage holes are positioned at 45 ± 10° and at 135 ± 10°, respectively, in respect to the horizontal axis H at the half of the septic water distribution pipe that during use is arranged to be facing the treatment bed.