The Hagen PT346 is a pond filter pump designed for ponds up to the following size:
The Max-Flo 2000 Waterfall Water Filter Pump - PT346 is great for use with filtration systems and for creating waterfalls and watercourses. This waterfall pump can handle particles up to 5/16 inches in size. This Max-Flo pump has a maximum flow rate of 2000 gallons per minute (gph).
The Hagen PT346 specifications: