ClearWater Tech’s PR-1300 UV ozone generator is equipped with a built-in air compressor for pressurized ozone delivery, and a 24-hour timer. It is perfect for use in odor control situations and low volume bodies of water in conjunction with a diffuser. Dimensions: 20.0? h x 9.0? w x 4.0? d, 21 lbs. Ozone Output: 0.25 grams/hour @ 20 SCFH on ambient air