CO2 fertilisation
Aquarium CO2 fertilisation - lush plant growth and healthy fish
Every aquarist who has been involved in aquaristics for a long time and is therefore considered an expert knows that CO2 fertilisation is of great importance for an aquarium. The growth of the plants is promoted and supported many times over, which in turn is of great benefit to the fish. In nature, CO2 is produced in the mostly muddy layer of the substrate. All plant species need carbon dioxide, i.e. CO2, to live and grow. Together with light and water, plants ultimately produce their most important energy source, namely sugar. The bottom line is that oxygen is the component that plants produce through the process of photosynthesis.
Aquarium CO2 fertilisation - many advantages
Regular CO2 fertilisation offers many other benefits apart from promoting growth. CO2 is virtually dissolved in the water as carbonic acid, which is particularly valuable for optimising the pH value. Fish tend to prefer acidic water because this property is more pleasant for the fish skin, for example. In addition, CO2 fertilisation successfully reduces algae growth and at the same time prevents unsightly limescale deposits on the leaves. BB Handel therefore has a selection of different products in the CO2 fertilisation category and is happy to make a corresponding recommendation if required. The plants and fish in your aquarium will thank you and reward you with beautiful growth and lively activity.
Filter products

Average rating of 5 out of 5 stars
Check Valve – Reliable Protection Against Backflow An effective check valve is essential for the safe operation of aquarium and CO₂ systems. The check valve with rubber flap provides one-way protection against water ingress, ensuring uninterrupted air and CO₂ supply. Advantages of the check valve: Protection against backflow – Prevents water from entering pumps and CO₂ fertilization systems. High-quality rubber flap – Ensures reliable sealing and long durability. Optimal size – Suitable for hoses with 4/6 mm diameter, versatile for various systems. Easy installation – Quickly integrated into the hose for immediate and secure operation. This check valve is ideal for aquariums, CO₂ fertilization systems, and air supply setups to ensure uninterrupted flow. Made from high-quality materials, it provides maximum safety and long service life.

Average rating of 5 out of 5 stars
Sera Flore CO₂ Active Reactor – Efficient CO₂ Diffusion for Healthy Plant Growth Optimal CO₂ supply is essential for vigorous plant growth and stable water values. The Sera Flore CO₂ Active Reactor ensures efficient CO₂ diffusion by mixing CO₂ bubbles intensively with aquarium water via special rotors and dissolving them to the maximum extent. Advantages of the Sera Flore CO₂ Active Reactor: Optimal CO₂ dissolution – High-performance rotors efficiently dissolve several hundred CO₂ bubbles per minute into the water. Flexible installation – Can be integrated into an existing water circuit (e.g., external filter) or alternatively operated with a pump. Space-saving mounting – Supplied bracket allows installation inside or outside the aquarium, e.g., in the cabinet. Algae-inhibiting material color – Smoke-grey design reduces algae growth and makes cleaning easier. Easy maintenance – Design allows effortless cleaning for long-lasting efficiency. Variants & Recommendations: Sera Flore CO₂ Active Reactor 500 – Up to 500 CO₂ bubbles/min, suitable for aquariums from 250 to 600 liters. Sera Flore CO₂ Active Reactor 1000 – Up to 1000 CO₂ bubbles/min, ideal for aquariums over 600 liters and heavily planted tanks. With the Sera Flore CO₂ Active Reactor, aquarists receive an innovative solution for CO₂ diffusion that ensures healthy plant growth and perfect water values. The efficient CO₂ dissolution maximizes nutrient uptake and creates a stable environment for all aquarium inhabitants.

Average rating of 5 out of 5 stars
CO₂ Cylinder Holder – Secure Mount for 500 g CO₂ Cylinders The CO₂ cylinder holder provides a reliable and stable solution for mounting 500 g CO₂ cylinders in aquarium CO₂ systems. It ensures secure positioning of the CO₂ cylinder and minimizes the risk of tipping or accidental impact. Advantages of the CO₂ cylinder holder: Optimal stability – Securely holds the CO₂ cylinder against movement and vibrations. Precision fit design – Specifically developed for mounting 500 g CO₂ cylinders. Space-saving installation – Enables neat and safe storage in the aquarium cabinet. Durable material – Long-lasting and resistant to external influences. Easy installation – Quick and uncomplicated setup for immediate use. This CO₂ cylinder holder is ideal for aquarists who want to safely and professionally organize their CO₂ fertilization system to ensure a stable CO₂ supply for healthy plant growth. Its precise construction and robust design offer maximum safety and convenience in any aquarium setup.

Average rating of 3 out of 5 stars
Sera Flore CO₂ Bubble Counter – Precise Control of CO₂ Supply for Optimal Plant Growth Accurate CO₂ dosing is crucial for successful fertilization of aquatic plants. The Sera Flore CO₂ Bubble Counter provides precise and easy monitoring of the CO₂ supply and allows exact adjustment of carbon dioxide fertilization. Advantages of the Sera Flore CO₂ Bubble Counter: Precise CO₂ dosing – Allows easy counting of CO₂ bubbles for optimal control of the CO₂ supply. Fine nozzle for clear bubble formation – Ensures clean bubble detachment for fast and accurate reading. Discreet placement – Compact design allows the bubble counter to be integrated unobtrusively into the aquarium. Optimal CO₂ usage – Prevents unnecessary CO₂ loss and ensures efficient carbon dioxide fertilization. Application & Extensions: The Sera Flore CO₂ Bubble Counter can be easily integrated into existing CO₂ fertilization systems and is especially suitable for aquariums with plant growth systems. With this reliable CO₂ bubble counter, aquarists receive a professional solution for accurate CO₂ control, optimizing plant growth and sustainably improving water quality. The precise dosing ensures efficient carbon dioxide distribution, contributing to a healthy and stable aquarium environment.

Average rating of 5 out of 5 stars
Sera CO₂ Cleaning Brush – Effective Cleaning for CO₂ Diffusers and Accessories Regular cleaning of CO₂ components is essential for efficient CO₂ diffusion and long service life of the system. The Sera CO₂ Cleaning Brush is specially designed to thoroughly and gently clean CO₂ diffusers, reactors, and hoses from deposits. Advantages of the Sera CO₂ Cleaning Brush: Targeted cleaning – Effectively removes algae, lime, and dirt from CO₂ diffusers and accessories. Gentle care – Special brush fibers ensure thorough cleaning without damage. Increased efficiency – A clean CO₂ system ensures optimal CO₂ supply for healthy plant growth. Universal application – Ideal for CO₂ reactors, diffusers, hoses, and other components of the CO₂ system. Durable material – High-quality brush fibers for long-lasting use. Application recommendation: Regular cleaning with the Sera CO₂ Cleaning Brush prevents deposits and maintains maximum system performance. Perfect for aquarists who want to maintain their CO₂ supply efficiently and sustainably. This cleaning brush ensures constant CO₂ diffusion, keeping plants optimally supplied and the aquarium healthy over the long term.

Average rating of 5 out of 5 stars
Sera CO₂ Pressure Gas Cylinder – Safe and Reliable CO₂ Supply for Aquariums The Sera CO₂ pressure gas cylinder ensures efficient and safe CO₂ delivery in aquariums and enables targeted fertilization for optimal plant growth. Made of high-quality steel, it offers maximum safety and certified quality. Advantages of the Sera CO₂ Pressure Gas Cylinder: Robust steel construction – Durable and resilient material for high safety standards. Integrated overpressure safety valve – Ensures safe operation without pressure fluctuations. External valve with handwheel – Easy handling for precise CO₂ dosing. Protective bracket for added safety – Prevents mechanical damage and secures the valve mechanism. Refillable CO₂ cylinder – Sustainable solution for long-term CO₂ use. Technical details: Material: High-quality steel for maximum stability. Safety: TÜV-certified overpressure protection. Valve type: Standard connection for common CO₂ pressure regulators. Use: Ideal for aquarium CO₂ fertilization systems to promote plant growth. The Sera CO₂ pressure gas cylinder is the perfect choice for aquarists who want to ensure a reliable, professional, and safe CO₂ supply in their aquarium. Thanks to its robust construction and precise control, it supports optimal nutrient supply for a healthy ecosystem.

Average rating of 5 out of 5 stars
Sera Flore CO₂ Fertilizer System – Optimal CO₂ Supply for Healthy Plant Growth A balanced CO₂ supply is essential for strong and healthy aquatic plants. The Sera Flore CO₂ fertilizer system enables efficient CO₂ delivery for aquariums up to 300 liters, promoting targeted plant growth. Advantages of the Sera Flore CO₂ fertilizer system: High-quality CO₂ components – Safe and precise CO₂ management for optimal plant care. Precision pressure reducer – Reduces cylinder pressure (approx. 50 – 60 bar) to the required working pressure (0.1 – 2.5 bar). Maximum CO₂ dissolution – Special CO₂ diffuser ensures effective CO₂ input without loss. Safe operation – 5 m CO₂ hose and check valve prevent aquarium water from entering the system. Permanent CO₂ monitoring – The Sera CO₂ long-term test allows continuous monitoring of CO₂ levels. Included in the set: Sera CO₂ pressurized cylinder (450 g CO₂) – With safety bracket, wall mount and standard connection (21.8 x 14), refillable. Sera Flore CO₂ pressure reducer – German precision manufacturing, with integrated needle valve. Sera Flore CO₂ diffuser – Maximizes CO₂ dissolution in aquarium water. CO₂ hose (5 m) and check valve – Ensures proper CO₂ flow and prevents water backflow. Sera CO₂ long-term test – Continuous monitoring for optimal water parameters. Sera Florena (100 ml) and Sera Flore Daydrops (50 ml) – Supplementary plant nutrients. Adapter for disposable CO₂ cylinders – Increases flexibility in usage. Extended control option: For automatic shut-off at night, the Sera Flore CO₂ fertilizer system can be combined with the Seramic pH Controller, allowing more efficient CO₂ control and dosing. The Sera Flore CO₂ fertilizer system provides aquarists with a professional solution for CO₂ supply, ensuring lush plant growth and stable water values – ideal for freshwater aquariums with demanding plant stock. Thanks to its high-quality components and ease of use, this system supports a healthy and stable aquatic landscape.

Average rating of 5 out of 5 stars
Sera CO₂ Hose 4/6 – High-Quality Connection for CO₂ Systems The Sera CO₂ Hose 4/6 is specifically designed for the safe and efficient use of CO₂ fertilization systems in aquariums. With a length of 10 meters, it offers flexible installation and reliable connection between CO₂ pressure regulators, diffusers, and other components. Advantages of the Sera CO₂ Hose: Optimal CO₂ flow rate – Ensures consistent CO₂ supply for plant growth. High-quality material – Special CO₂-resistant tubing prevents gas loss. Standardized size – 4 mm inner diameter, 6 mm outer diameter, fits common CO₂ systems. Flexible and easy installation – 10 m length allows custom setups and professional aquarium layouts. Resistant to pressure and kinks – Ensures uninterrupted long-term operation. Application possibilities: The Sera CO₂ Hose 4/6 is ideal for CO₂ diffusers, reactors, solenoid valves, and other accessories. It enables safe and efficient CO₂ supply, promoting healthy plant growth in the aquarium. With its high-quality craftsmanship and reliable function, this CO₂ hose is an essential component for any aquarium CO₂ system – perfect for professional and stable CO₂ fertilization.
Content: 10 linear meter (€1.90 / 1 linear meter)

Average rating of 5 out of 5 stars
Sera Flore CO₂ Pressure Diffuser – Efficient CO₂ Diffusion for Optimal Plant Supply The Sera Flore CO₂ Pressure Diffuser combines innovative technology with high-quality design to ensure precise CO₂ supply in aquariums up to 300 liters. Thanks to the fine-pored ceramic membrane, ultra-fine CO₂ bubbles are generated, which dissolve optimally in the water and specifically promote plant growth. Advantages of the Sera Flore CO₂ Pressure Diffuser: High-quality acrylic glass – Elegant and durable material for safe use. Fine-pored ceramic – Produces particularly fine CO₂ bubbles for maximum CO₂ absorption. Integrated bubble counter – Provides precise control of the CO₂ supply for optimal dosing. Easy cleaning and maintenance – The diffuser can be quickly removed and cleaned or replaced. For aquariums up to 300 liters – Ideal for variously planted freshwater aquariums. Extended application possibilities: The Sera Flore CO₂ Pressure Diffuser is perfect for CO₂ fertilization systems and can be easily integrated into existing aquarium setups. With its effective CO₂ diffusion, it significantly contributes to stable water quality and healthy plant growth. Thanks to its high-quality construction and well-designed features, this CO₂ diffuser is an essential component for aquarists who want to optimally supply their plants with CO₂.

Average rating of 4 out of 5 stars
Sera CO₂ Solenoid Valve – Precise CO₂ Shut-Off Control for Efficient Fertilization CO₂ supply in aquariums should be optimally regulated to promote plant growth while minimizing gas consumption. The Sera CO₂ Solenoid Valve enables automatic nighttime shut-off and can be flexibly controlled with a timer. Advantages of the Sera CO₂ Solenoid Valve: Automatic CO₂ shut-off – Precisely regulates the CO₂ supply during the night or at set times. Energy-efficient control – Prevents unnecessary CO₂ consumption, saves resources, and optimizes fertilization. Compatible with existing CO₂ systems – Usable in new and existing pH-controlled CO₂ fertilization systems. Easy installation – Mounted between the CO₂ pressure regulator and the CO₂ gas cylinder. Reliable operation – Safe function thanks to high-quality materials and precise technology. Technical requirements & application: Requires a CO₂ pressure regulator for safe integration into the CO₂ system. Works with standard timers to enable automatic control. Optimal addition to CO₂ fertilization systems to ensure environmentally friendly and controlled CO₂ supply. With the Sera CO₂ Solenoid Valve, aquarists receive an efficient solution for controlling the CO₂ supply, enabling precise regulation and ensuring a stable aquarium ecosystem. Thanks to the automated night shut-off, CO₂ consumption is optimized while plants continue to be optimally supplied.

Average rating of 5 out of 5 stars
Sera O-Ring for Filling Adapter – High-Quality Seal for Safe CO₂ Usage The Sera O-Ring for Filling Adapter ensures a reliable seal during CO₂ filling processes and prevents gas leaks. With its precise fit, it provides a stable connection between the filling adapter and the CO₂ bottle, enabling safe and efficient use. Advantages of the Sera O-Ring for Filling Adapter: Optimal sealing – Prevents gas leaks and ensures a stable CO₂ flow. High-quality material – Durable and resistant for long-term use. Perfect fit design – Specifically developed for use with Sera filling adapters. Easy installation – Effortless replacement for consistently safe application. The Sera O-Ring for Filling Adapter is the ideal solution for aquarists who want to operate their CO₂ fertilization systems reliably and efficiently. Thanks to its robust construction, it offers maximum safety and a long service life. This seal ensures uninterrupted CO₂ supply and supports healthy plant growth in the aquarium.

Average rating of 5 out of 5 stars
Sera O-Ring for Pressure Regulator – Secure Seal Ring for Reliable CO₂ Regulation The Sera O-Ring for Pressure Regulator is an essential spare part for safe and efficient CO₂ dosing in aquariums. Thanks to its high-quality design, it ensures a reliable seal and prevents gas leakage, keeping CO₂ supply consistently optimal. Advantages of the Sera O-Ring for Pressure Regulator: Perfect sealing – Prevents gas leaks and ensures stable CO₂ delivery. High-quality material – Durable and resilient for maximum safety. Precision fit – Specially developed for use in Sera CO₂ pressure regulators. Easy installation – Simple replacement of the O-ring for reliable operation. Extended application possibilities: The Sera O-Ring for Pressure Regulator is ideal for regular replacement in CO₂ systems to ensure effective and safe CO₂ regulation in aquariums. Thanks to its robust construction and precise fit, this O-ring ensures optimal sealing performance, enabling uninterrupted CO₂ supply – perfect for healthy plant growth and stable water values.

Average rating of 5 out of 5 stars
Sera Flore CO₂ Pressure Regulator – Precise Pressure Regulation for Reliable CO₂ Supply A safe and controlled CO₂ supply is essential for healthy plant growth in aquariums. The Sera Flore CO₂ Pressure Regulator, made in Germany, ensures precise pressure reduction and allows optimal dosing of the CO₂ content. Advantages of the Sera Flore CO₂ Pressure Regulator: Reliable pressure reduction – Reduces the cylinder pressure from approx. 50 – 60 bar to the required working pressure (0.1 – 2.5 bar) for controlled CO₂ supply. High-quality needle valve – Precise adjustment of the CO₂ quantity to suit the needs of the aquarium. Universal compatibility – Can be connected to all standard CO₂ cylinders with external valve. Safe handling – Robust construction for maximum safety and stable CO₂ dosing. Optimal CO₂ control: The Sera Flore CO₂ Pressure Regulator ensures a consistent and reliable CO₂ supply that promotes aquatic plant growth and ensures stable water quality. With this precise pressure regulator, aquarists receive a professional solution for CO₂ dosing – ideal for sustainable and efficient plant care in the aquarium. Thanks to its precise regulation mechanisms and high-quality manufacturing, it ensures optimal CO₂ distribution that keeps the aquarium system stable in the long term.

Average rating of 5 out of 5 stars
Sera Reducer 10 mm to 6 mm – Precise Adjustment for Aquarium and Filter Systems The Sera Reducer allows for a smooth transition from 10 mm to 6 mm and ensures a secure connection between hoses in aquarium, filter, and CO₂ systems. Its high-quality construction guarantees stable and reliable flow without pressure loss. Advantages of the Sera Reducer: Precise size adjustment – Enables a secure connection between 10 mm and 6 mm hoses. High-quality material – Durable construction for maximum sealing and stability. Versatile applications – Ideal for aquariums, CO₂ fertilization systems, filtration technology, and water flow systems. Easy installation – Simple integration without additional modifications. The Sera Reducer 10 mm to 6 mm is the perfect solution for aquarists seeking a reliable hose connection and precise adjustment of water flow or CO₂ supply. Thanks to its robust design and user-friendly handling, it ensures maximum functionality and secure connections in any aquarium system.

Average rating of 5 out of 5 stars
Sera Seramic Aquarium pH Controller – Precise CO₂ Regulation for Optimal Water Parameters Proper CO₂ dosing is essential for plant growth and water quality in aquariums. The Sera Seramic Aquarium pH Controller enables automatic regulation of CO₂ supply based on the measured pH value, ensuring plants are always optimally nourished. Advantages of the Sera Seramic Aquarium pH Controller: Automatic CO₂ control – Regulates CO₂ supply according to the aquarium's pH level. Digital precision measurement – Reliably measures the pH value of the aquarium water. Simple connection – CO₂ system is connected via socket and automatically controlled. Self-regulating operation – After setting the desired pH levels, the control runs fully automatically. Universal compatibility – The included solenoid valve is compatible with standard CO₂ systems. Included in the set: Digital Sera Seramic Aquarium pH Controller with power supply and external socket. Solenoid valve for precise CO₂ dosing. Sera pH measuring electrode for accurate water analysis. Two suction cups & universal mounting bracket for flexible installation. Universal mounting plate for stable placement. Sera calibration solutions pH 4.0 & pH 7.0 for electrode calibration. 3 m CO₂ hose (4/6 mm) for secure connection. Check valve to prevent backflow of water into the system. Versatile applications: The Sera Seramic Aquarium pH Controller is suitable not only for CO₂ fertilizer systems but also for operating calcium reactors and dosing pumps. With the Sera Seramic Aquarium pH Controller, aquarists receive a precise, digital solution for pH regulation and CO₂ control – ideal for stable water quality and optimal plant care. This high-tech system ensures healthy, lush plants and a perfect aquarium climate.

Average rating of 5 out of 5 stars
Adjustable T-Connector – Flexible Water Distribution for Aquariums and Pond Systems Reliable water management is essential for optimal filtration and water circulation. The adjustable T-connector enables precise water distribution and is perfectly suited for use in aquariums and pond systems. Advantages of the adjustable T-connector: Flexible water distribution – Ideal for adjusting water flow in filter and pump systems. Adjustable branch – Allows individual control of water flow for various applications. High-quality construction – Durable material for long-lasting and safe use. Easy installation – Quick integration into existing hoses and filter systems. Size variants & technical details: Small version: 2 x 12/16 mm, 1 x 6/8 mm (adjustable) Ø 12 mm inner, Ø 16 mm outer Large version: 2 x 16/22 mm, 1 x 6/8 mm (adjustable) Ø 16 mm inner, Ø 22 mm outer With the adjustable T-connector, aquarists receive a practical and versatile solution for water distribution – perfect for customized aquarium and pond setups. The precise control ensures optimal water circulation and efficient filtration.

Average rating of 5 out of 5 stars
Sera Water Hose 6/8 mm – Robust and Flexible Solution for Aquariums The Sera Water Hose 6/8 mm offers a durable and versatile option for water guidance in aquariums. With a length of 10 meters, it allows flexible installation and is ideal for various applications such as filtration systems, CO₂ setups, and water changes. Advantages of the Sera Water Hose: High-quality material – Sturdy and durable hose for maximum safety in aquarium systems. Optimal size – Inner diameter 6 mm, outer diameter 8 mm, ideal for common aquarium equipment. Versatile use – Perfect for aquarium filters, CO₂ systems, water changes, and air pumps. Flexible and easy to install – 10-meter length allows custom installations and simple setup. Resistant to kinks and pressure – Ensures uninterrupted water flow. Technical application possibilities: The Sera Water Hose 6/8 mm is compatible with many common aquarium systems and is ideal for use with CO₂ diffusers, water filters, check valves, and other accessories. With its high-quality construction and optimal flexibility, this hose provides safe and reliable water guidance in aquariums – an essential component for stable water quality and professional aquarium technology.
Content: 10 linear meter (€1.69 / 1 linear meter)

























































































































































