Media bed filters for filtering fine particles from a raw liquid flow and method of using the same

A method for filtering a raw liquid flow comprising:

• providing a media bed filter comprising a tank having a top portion and a bottom portion defining a bottom surface, one or more raw liquid inlets and one or more filtered liquid outlets and a media bed having a supporting media disposed on the bottom surface and a filtering media covering the supporting media, the top portion of the tank being above the filtering media of the media bed,
• providing a nozzle configuration within the tank to circulate the raw liquid flow,
• disengaging the filtering media without erosion or deposition by circulating the raw liquid flow in a horizontal direction within the filtering media at a horizontal and parallel velocity substantially equal to a disengagement velocity of said filtering media to produce a filtered liquid, and
• collecting said filtered liquid through said one or more liquid outlets below said filtering media.