Why You’ll Love It
Give your planted tank the CO₂ it needs to thrive with the hygger CO₂ Generator Kit. Built for durability, precision, and safety, it delivers consistent, high-purity CO₂ through a proven citric acid and sodium bicarbonate reaction—eliminating the pressure instability found in traditional DIY generators. Whether you have a small aquascape or a large, high-light planted setup, this system offers dependable performance and professional-grade components.
Key Features
Professional CO2 Generator System
hygger HC018 CO2 bottles are constructed from premium SUS304 stainless steel bottles (25% thicker than standard tanks), providing superior durability, stability, and pressure resistance compared to plastic bottles. Far superior to plastic bottle generators, they’re more durable, stable, safe, and high-pressure resistant for aquarium-planted tanks.
Premium Safety Protection
The CO2 generator’s automatic pressure relief valve activates when pressure exceeds 30–35 kg; the 12V waterproof quick connection solenoid valve prevents leaks. Producing high-purity CO₂ with consistent pressure.
Professional CO2 Reactor DIY Kit
A complete system in a 2L/5L size bottle includes a stainless steel bottle, regulator, solenoid valve, triple filter element, precision needle valve, and easily adjustable bubble counter with built-in check valve. Monitors CO₂ flow and stops water from flowing back into the cylinder.
High Precision CO2 injection
Timer-compatible solenoid lets you control injection times; bubble counter ensures accurate dosing and prevents backflow into the tank. Available in 2 L or 5 L to match different tank sizes and CO₂.
Usage Tips
Size-Specific Options
The 2 L model is compact and ideal for smaller aquariums or moderate CO₂ needs.
The 5 L model is better suited for larger or high-light planted tanks, reducing refill frequency and meeting higher CO₂ demands.
Installation & Setup
Follow the included manual for assembly.
Secure all connections—especially at the regulator, solenoid, and bubble counter.
Connect the solenoid to a timer for automated injection control.
Operating Safely
Required citric acid and sodium bicarbonate powders are not included—purchase separately.
Never invert the bottle. Avoid using strong acids or alkalis.
Adjust CO₂ flow gradually based on tank size, plant density, and species needs. Over-injection can cause fish hypoxia.
Maintenance Advice
Wipe down components after each use and keep them dry.
Check seals, tubing, and fittings regularly for wear.
Replenish reaction materials as needed to maintain consistent output.
Specifications
2L: calibre-10cm, height-34cm, thickness-1.2mm
5L: calibre-13cm, height-40cm H, thickness-1.5mm
Package:
1 x 2L/5L SUS 304 stainless steel cylinder
1 x SUS 304 stainless steel regulator
1 x Triple filter element
1 x Quick connection solenoid valve
1 x Large & small sealing ring
1 x CO2 bubble counter & diffuser
4 x Suction cup
1 x CO2 tubing 2m
1 x Check valve
1 x U-bend tube
1 x Silicone collapsible funnel
1 x User manual
People Also Buy
I’ve been using the Hygger 2-liter CO₂ system in my planted aquarium, and it has proven to be both practical and reliable. The unit works with a simple mix of citric acid and baking soda, which generates a steady and safe pressure to supply CO₂ consistently.
The regulator with its pressure gauge gives me peace of mind, since I can monitor the levels at all times. The solenoid valve is a great addition—it allows me to connect the system to a timer so the CO₂ runs in sync with the aquarium lights, saving gas and keeping the cycle natural for the plants.
Setup was straightforward: the stainless steel cylinder feels solid, the diffuser spreads bubbles evenly, and the integrated bubble counter makes adjusting the flow easy. The only detail is that the first time you prepare the mixture, it takes several hours to reach optimal pressure, but once it stabilizes, it stays consistent.
In terms of results, my plants have shown faster growth and more vibrant colors, especially carpeting species and reds. I’ve also noticed fewer algae issues, since the balance between light, nutrients, and CO₂ is much easier to maintain.
The only downside is the need to refill the citric acid and baking soda periodically, and the fact that it’s not powerful enough for very large tanks (over 150 liters). But for medium-sized aquariums like mine, it’s an efficient and affordable solution compared to traditional pressurized systems.
The Hygger 2-liter CO₂ system has a sleek, modern look that complements any aquarium setup. Its brushed aluminum cylinder gives a clean, professional appearance, while the compact design avoids clutter around the tank. The transparent bubble counter adds a touch of precision and elegance, allowing aquarists to enjoy both functionality and style. Overall, it’s a visually appealing piece of equipment that enhances the aesthetic of a planted aquarium without being obtrusive
The value of this kit and effectiveness is unmatched. I looked around for a while at other CO2 options but they were a minimum of $200. Then I found this and it’s a blessing and works wonderfully.
Wonderful product so far so good so far its been running for 6 days no problems starting building pressure right away and still sitting @ 40 psi and plants are pearling away I highly recommend this product
If I only knew how easy it is to instal Hygger CO2 System, I would have used it in the very beginning. The product was built and looks high quality. I have been using Hygger with our Aquarium Light, Water Change Vacuum Siphon and now the CO2. That’s why I trust this brand. It looks good outside the cabinet too so I like to flex it outside the tank. I have no issues using this CO2 Generator. I made a full review on my YouTube account Jhedo Kings and made a step by step installation of this awesome product for first time users like me! Thank you so much Hygger for this wonderful CO2 System. My plants love me know because of you! Thank you so much! 🙏🙏🙏
This works so much better than I thought. The consistency of the co2 added with the timer. It’s a MUST HAVE.