Aerates up to 2,000 gallons. Can be used outdoors during the hot summer months as well as the cold harsh winter months. Adjustable air flow regulator. Includes a high-efficiency, quad-output compressor that uses only 8 watts with a max air flow of .31 cfm. Also includes 4 rolls of 30 foot black vinyl tubing, 4 blue airstones and 2 check valves.