The ozone generators of the Aqua Medic ozone series are based on the latest low-voltage technology. They reliably prevent the water from turning yellow and the water becomes crystal clear. Ozone improves protein skimming and increases the redox potential. The bacterial load in the water is reduced, thus preventing fish diseases. In addition, the degradation of toxic nitrite is supported. Aqua Medic ozone 250 is adjustable and suitable for freshwater and saltwater aquaria.technical data Aqua Medic ozone 250 -ozone generator-ozone power mg/h max.: 250power consumption: app. 5 Wpower supply ozone generator : 12 Vpower supply transformer 110-240 V/50-60 Hziir flow (l/h) ca.: 100-500for freshwater aquaria up to 3000 lfor saltwater aquaria up to 1500 lconnection for hose (mm): 4/6dimensions l x w x h (mm) app.: 178 x 84 x 46an membrane air pump is needed (not included)