The sera flore CO2 active reactor 500 with twin rotor supersede the generation of static CO2 reactors. The rotors, the upper one of which is designed as a lamella rotor, ensure strong blending of CO2 with the aquarium water, allowing to dissolve several hundred CO2 bubbles per minute. Dissolving CO2 correctly and in sufficient amounts in freshwater aquariums is the key to good and lasting plant growth, especially in larger aquariums. Added CO2 that is only partially dissolved will escape via the water surface in smallest bubbles and does not reach the plants where it is actually required. The sera active reactors are designed for optimized currents, provide excellent performance capacity and can completely dissolve even large amounts of CO2. They can entirely be disassembled, and are therefore easy to maintain and clean. The sera flore CO2 active reactor 500 is suitable for freshwater aquariums between 250 l and 600 l and can be integrated into an existing filter circuit outside the a