The Red Sea C02 Reactor (Reaktor) 500 efficiently dissolves CO2 into aquarium water. This fully adjustable, power driven, super compact CO2 reactor will simply and efficiently maintain the desired level of CO2 in a wide range of planted aquariums. The turbulent flow CO2 / water interface inside the reactor ensures almost complete dissolving of available CO2 while non-dissolvable gases are gently vented to the water surface.Please look at our CO2 System Info page for a complete list of products needed for a complete CO2 setupHighly effective vortex reaction chamberAdjustable flow 250 l/h (65 gal/h) pumpSuper compact design 9.5 x 4 x 5.5 cm (3.75" x 1.6" x 2.2")Dissolves CO2 at flow rates of up to 180 bubbles per minuteSuitable for planted aquariums 40 to 500 Liters (10 125 gal)