The VORTEX SOLIDS FILTER is a unique, multi purpose filtration unit designed to enhance existing filters, and perform multiple functions as a stand alone filtration system. For existing waterfall filters, This Vortex filter is a solids separator, a fine particulate pre-filter, and a bio media aerator. The Vortex Filter can also be installed as a up-flow filter, a moving bed aerated bio filter, or a mechanical pre-filter/aerator. The Vortex filter is a innovative approach to providing many types of filtration functions in one heavy duty, economical unit. The Vortex filter is the best choice for your advanced filtration requirements.