Red Sea Fish Pharm ARER51034 Aquarium CO2 Reactor Pump Plant Care Products, 500-Liter 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 Highly effective vortex reaction, adjustable flow 250 liter per hour pump Dissolves CO2 at flow rates of over 180 bubbles per minute and suitable for planted aquariums 40 to 500 liters