The basket strainer (filter) is mainly composed of a nozzle, a main pipe, a filter basket, a flange, a flange cover and a fastener. When the liquid enters the basket through the main tube, the solid particles are blocked in the strainer basket, and the clean fluid passes through the filter basket and is discharged from the filter outlet. When cleaning is required, unscrew the screw plug at the bottom of the main pipe, drain the fluid, remove the flange cover, and refill it after cleaning. Therefore, it is convenient to use and maintain.