Pond boss Universal Pump Filter Box is ideal for use in ponds up to 500 gallons. The box works with most pumps and is designed to prolong the life of the pump and protect clogging from debris. It includes dual filtration pads; a course pad to catch large debris and a fine pad to catch small debris. Bio Balls are also included to promote growth of beneficial bacteria. Seamlessly keep your pond water clean with pond boss Universal Pump Filter Box. Dimensions: 12.25 in. x 6.25 in. x 6 in.