DUPLEX FILTER Russian patent published in 2017 - IPC B01D24/10 

FIELD: construction.

SUBSTANCE: duplex filter comprises the housing with the top and the bottom nozzles for water, the upper drainage and control device, the middle horizontal partition with openings, the lower horizontal partition equipped with the drain caps, the working surface of which faces the upper drainage and control device, the additional horizontal partition installed below the middle horizontal partition and equipped with the drain caps, the working surface of which faces the lower horizontal partition, the additional water nozzle placed on the lateral housing surface between the middle and the additional horizontal partitions, and granular loading. The middle horizontal partition openings are equipped with the drain caps, the working surface of which faces the upper drainage and control device. The granulated loading is placed on the middle and the lower horizontal partitions. The additional water nozzle is made with the possibility to supply water for washing the granular loading placed on the middle horizontal partition and for discharging the spent wash water after washing the granular loading placed on the lower horizontal partition. The additional horizontal partition is set lower than the middle horizontal partition above the granular loading placed on the lower horizontal partition.

EFFECT: provision of washing granular loadings independently from each other.

2 dwg