There is provided a portable liquid filtering apparatus for filtering liquid used in a container, such as cooking oil in deep fat fryers. The apparatus includes a mounting bracket that attaches to a portion of the container. The mounting bracket supports a liquid pump. A filter assembly including at least one filter element is removably disposed in the container, and is connected to the pump inlet by a suction tube. The pump draws the liquid through the filter element and suction tube and propels it into a discharge tube connected to the pump outlet. The discharge tube discharges the filtered liquid back into the container for reuse. The mounting bracket is adjustable for attachment to various sized containers. The suction tube and the discharge tube are shaped to conform generally to the shape of the container.