Pondmaster Pro 2000 Waterfall Box – A durable waterfall spillway filter box that helps create a beautiful waterfall feature while adding filtration to your pond. It features an 11.25-inch wide spillway lip for excellent water aeration and can hold biological filter media (like bio-balls or mats, not included) to support beneficial bacteria. The Pro 2000 box is easy to conceal at the pond’s edge and comes with stepped hose fittings to accommodate various pump tubing sizes, making installation and maintenance convenient.