A self-cleaning disc filter apparatus for filtering a liquid, water, utilizing a plurality of stackable/de-stackable disc filter media within a filtering housing, the liquid flows through the housing in two flow directions, a first flow direction during a filtering phase and a second direction of flow during a self-cleaning phase; the filtering housing is fit with an internal fluid diverter that controls the direction of flow through the filter housing, the status of the filtering media, initiating filter media cleaning, therein the internal fluid diverter control the overall status of the filter apparatus, the internal fluid diverter is configured to change between filtering phase and self-cleaning phase with a single turn of the fluid diverter.