Patent ID: 6773606
Filing Date: 2004-08-10
Classification: B01D

Abstract:
A septic tank and system for pumping liquid from the septic tank as effluent to a drain field comprising:a pump for drawing liquid from the septic tank and pumping the liquid as effluent to the drain field; a strainer for straining certain particulate matter from the liquid before the liquid enters the pump; the strainer comprising a straining screen through which the pump draws the liquid for limiting the size of particulate matter that can pass to the pump; at least one nozzle that receives some of the effluent being pumped by the pump and that is aimed toward the screen for directing effluent toward the screen to dislodge particulate matter from an area of the screen while the pump draws liquid through the screen; wherein the screen and nozzle are arranged for relative movement so that the area of the screen being acted on by the effluent from the nozzle changes as the pump operates.