16" Savio FilterWeir - Falling Water & Bio-Mechanical Filtration The extremely popular 16" Savio FilterWeir creates a breathtaking 16" curtain of falling water, while offering supplemental bio-mechanical filtration that supports the growth of beneficial bacteria. Water filters, then falls. Use two 16" units side-by-side for larger waterfalls, or create a waterfall cascade by installing two or more weirs in a stair-step pattern. 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. Inlet connects to 2" I.D. PVC fitting. 16" FilterWeir is rated for pump flows from 900-3000 gph.