Hydrotools 16″ Sand Filter System is designed from the ground up to provide efficient, trouble-free filtration, ease of maintenance, and long life. It provides an efficient, easy to use, simple to install and operate system that will keep pool water clean and sparkling. The core of this system is the one-piece blow-molded non-corrosive tank with superior strength and durability. Includes a top mount, 6-position multi-port valve and has a high capacity sand bed to catch more debris and extends filter cycles.