In the case of the slush pump system, air is pumped into the ascending branch of the inverted siphon, resulting in a lower average medium density of the air-water-column than in the descending branch. Accordingly, the hydrostatic pressure in the ascending branch is lower than in the descending, which means that the pressure curve is no longer horizontal, but inclined. This difference in pressure creates a flow through the inverted siphon.

Pressurized air is to be added in volumes that ensure a flow velocity in the inverted siphon that is sufficient to mobilize deposits. Due to the increased flow velocity, an inverted siphon that is supported by a flushing pump transports more water than in its normal mode. Usually, the dry weather runoff and the volume of the inverted siphon only shortly suffice for a flushing pump operation, because, otherwise, the inverted siphon runs dry. In this case, additional sewage volume has to be provided. This can be achieved by an additional sewage reservoir in the descending branch of the inverted siphon. While the slush pump is out of service, the regular dry weather runoff fills this storage volume, so that it is available for the next flushing process.

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