For a targeted and very precise CO2 supply in freshwater aquariums, or into calcium reactors. Features an electronically controlled valve that produces one CO2 portion / CO2 bubble every 0.1 to 10 seconds. The number of bubbles / portions is adjustable from 10 per second to 1 every 10 seconds and the rate of delivery is constant to +/- 1/1,000th of a second. Advantages: The CarbonDoser® replaces a CO2 valve and a bubble counter, and additionally ensures stable, precision CO2 dosing with guaranteed safety. In reef systems, it significantly improves the convenience, while lowering the risk, of using a calcium reactor to replenish critical minerals The device completely removes the potential for erratic performance as may be experienced with other methods CO2 regulation maintains extreme precision even with pressure fluctuations The device is intuitive, user-friendly, compact and easy to operate Compatible with Neptune, Hydros, GHL, PinPoint and of course with TUNZE® pressure reducer 7077/3 as well as the TUNZE® calcium reactors 3171 and 3172 In freshwater systems, the CarbonDoser® is perfect for CO2 dosing to optimise plant growth, making laborious CO2 adjustment a thing of the past Delivered with quality non-return valve, all necessary hoses, 12V power supply.