Bio CO2 fertilization system for freshwater aquariums. Complete set for uniform CO2 fertilization. Refillable reaction container made of stainless steel with a pressure relief valve. Includes CO2 Constant Gel for at least 40 days of consistent CO2 production. Promotes healthy, robust plants and vibrant colors. Carbon is the most important nutrient for aquarium plants. Suitable for all freshwater aquariums up to 120 liters. The Dennerle Carbo Bio Style 120 Bio CO2 fertilization system is the solution to the essential CO2 needs of your freshwater aquarium up to 120 liters. CO2 production begins within just 24 to 48 hours after installation, ensuring a healthy aquarium ecosystem. Thanks to the specially designed Bio CO2 diffuser, the valuable CO2 is effectively dissolved in the water. The modern and timeless design makes the system an eye-catcher right next to your aquarium. With a pressure relief valve, pressure-resistant CO2 hose, and solid hose fittings, you can rely on operational safety. The stainless steel reaction container is refillable and durable, while the CO2 Constant Gel is made from 100% renewable resources. Get the complete set now for uniform CO2 fertilization and enhance the health and beauty of your aquarium.