Co2 diffussors and reactors are used to get CO2 dissolved in the water of your aquarium. There are many
diffrent types commercially available as well as DIY types. The general principal is to get the CO2 to have as long a contact as possible with the water to give it time to dissolve. It is done in a few ways some of them quite complex others as simple as an upside down collection bowl or dome under the water that the CO2 will stay in till dissolved. Others use air type stones or power heads that that the gas is bubbled through to try and get a high contact with the aquarium water. We offer the more co2 devices for the planted tank than any other aquatic supplier. Co2 keeps algae in check and encourages accelerated growth in freshwater planted aquariums. Be sure to check out our other Co2 Equipment - co2 diffusors, reactors and regulators.