Abstract: The apparatus comprises a housing having an inlet and an outlet. The apparatus uses a single central rod coupled to one end of the housing. A support member is coupled to the other end of the rod. The support member has a plurality of threaded apertures extending therethrough through which threaded members are screwed for use for holding annular filter members in place. The support member and threaded members may be used at either end of the housing to hold the filter members in place. In several embodiments, the threaded members have convex, conical shaped ends which mate with concave conical shaped surfaces of seal members which act to center and seal the ends of the annular filter members.

Abstract: The pump is formed by pump housing defining a pump housing cavity and a column housing defining an elongated cavity. The front of the column housing is coupled to the rear of the pump housing cavity. A shaft axially from the rear of the column housing cavity into the pump housing cavity. An impeller is connected to the front of the shaft for rotation in the pump housing cavity for moving liquid from the front inlet through an outlet transverse to the axis. The impeller has vanes on its front and rear sides. A baffle is fixedly secured to the front of the column housing around the shaft and has vanes on its rear side for preventing liquid rearward of the baffle in the column housing cavity from rotating.