You can position this pump in your pond vertically or horizontally.

. OASE Atlantis Pumps The new OASE Atlantis Pumps are ideal for powering waterfalls and streams. The pump can be positioned either vertically or horizontally and is not prone to clog because of the positioning of the pump intake. Atlantis pumps carry a three year guarantee with an additional two years when you register the warranty with OASE. The "JAWS" or "Jet-Activated-Wash-System" enables simple cleaning of the pump's pre-filter. Simply attach any garden hose for quick and easy pump cleaning.