Media into the cylinder body from side to take over the other side take over the cylinder body of the filter hole tube connected filter hole in possession of many a diameter of 3 mm holes. Impurities in the medium particles Kong filter out accumulated in the bottom of the tube, no impurity particles in the media after the outflow of exports from the filter holes. Open the drain valve when the sewage discharge of the impurity particles. Proposed to install a valve between the decontamination at the entrance and pipeline, sewage when closed, open the drain valve, so that media flow from the filter hole, play a role in filling wash.