The Outdoor Water Solutions AerMaster Pro 9 Electric Pond Aerator proves there’s nothing better for a healthy pond than bottom diffused aeration. Aeration helps eliminate stratification, reduces bottom muck by circulating oxygen-rich water and increases the amount of nutrient- and organic matter-hungry aerobic bacteria to reduce algae growth. Also helps keep fish alive during winter freezes, pond turnover or low oxygen conditions. Includes 500ft. of 1/2in. weighted airline.