AQUATEK Ozone Generator for Marine or Freshwater Aquariums State-of-the-art ozone generator for marine or freshwater aquariums. Unit offers adjustable output levels, suitable for all tank sizes. Utilizes high frequency switching technology. No regular maintenance required. Sterilize without harmful chemicals. Interface with all Redox (ORP) controllers. Maximum Output: 150mg / hr Dimension: L 8" x W 7"x H 2.5" Designed for 110V / 60Hz 7Watts (Air pump and stone are not included)