The Eheim CO2 Set 600 is a complete fertiliser system for planted aquaria or aquascape up to 600L. This simple and easy to use kit comes supplied with everything else that you need to dose the correct amount of CO2 into your aquarium, encouraging stronger and healthier plant growth.\n\nEheim CO2 sets offer a simple and reliable way to supply the correct amount of CO2 into your aquarium for healthy plant growth.\n\nAquarium water usually contains too little carbon dioxide (CO2) as it has already been extracted from the tap water at the waterworks. \n\nIn addition to light, nitrogen, phosphate, and trace elements, etc., the most important nutrient for aquarium plants is CO2 and, the stronger and healthier the plants, the less chance algae has to grow.\n\nPlants also produce more of the oxygen that fish need to breathe, and CO2 also regulates the pH values in the water, when dosed correctly.\n\nWhen using one of these systems, especially with correctly dosed plant food, you will se.