Improved Pump Efficiency Prevents flow reduction due to premature clogging Improves energy conversion to water flow Extends pump lifespan Highly Efficient Filtration Multiple pore size Depth filtration: large filter volume to capture, store, and digest particles. Large specific area for bio-filtration Dimensions: 13 inches x 7.5 inches (D x H)Use on pond pumps up to 9 inches in diameter. Maximum pump flow rate is 5,000 mph.