Sunterra 300206 Pond Bio-Filter 2000 Gallons, Black Dual Filtration System to provide a Clearer and Healthier Pond or Water Garden Cleans Ponds up to 2000 Gallons Recommend for use with Pond Pumps Capable of Pumping between 1250 to 2000 Gallons of Water per Hour Covered by Amazon's A-Z 30 day guarantee