The 31" Savio FilterWeir™ creates a breathtaking 31" curtain of falling water, while offering supplemental bio-mechanical filtration that supports the growth of beneficial bacteria. Water filters, then falls. This easily installable weir provides the tranquil sounds and visual splendor of a cascading waterfall on a large scale. Manufactured with a super-strong injection molded housing unit, this exceptional waterfall weir creates a professional waterfall effortlessly, and is easy to retrofit to existing ponds, and pond free systems, with flow rates up to 10,000 gallons per hour. Includes two faceplate spillways, and a sturdy media grate for stones or potted plants.