Dosing Chambers
After the effluent has passed from a tank after being treated by one or more of the preliminary processes, it usually flows into a compartment known as the dosing chamber where it is admitted to the filter for further purification.
When enough of the liquid has accumulated in the chamber it is automatically emptied by means of a siphon, thus permitting the intermittent application of the sewage to the filter bed. When more than one bed is used the siphons are arranged so that the liquid alternately flows to different filters or parts of filters.