Wyin Aqua Citric Acid CO₂ System – Stainless Steel 5L Complete Kit with Regulator, Solenoid & Diffuser

The Wyin Aqua Citric Acid CO₂ System (5L) is a powerful and budget-friendly alternative to pressurized CO₂ systems. Designed for larger or high-demand planted aquariums, this complete stainless steel setup generates CO₂ through a chemical reaction between baking soda, citric acid, and water. The mixture is added directly into the stainless steel cylinder—no extra chambers or high-pressure gas refills required.

The 5-litre polished stainless steel cylinder offers extended operation before refilling and is built for durability with a sleek, corrosion-resistant finish. It’s paired with a precision regulator, 12V DC solenoid valve, and a standard aluminium bubble counter with an integrated check valve. Also included is a ceramic diffuser, 2 metres of CO₂-resistant tubing, and a U-bend connector for clean routing over the tank rim.

This system is ideal for aquarists who want longer intervals between refills and increased control over CO₂ delivery to support healthy, lush plant growth.

How It Works:

Add citric acid, baking soda, and water directly into the stainless steel cylinder. As the solution reacts, it produces CO₂ gas, which is then regulated and delivered into your aquarium. No gas refills or high-pressure cylinders required—just top up the mixture as needed. Please note: baking soda and citric acid are not included.

Instructions for Use (5L Cylinder):

1. Prepare Your Mixtures: Use 700 grams of citric acid and 800 grams of baking soda. These materials are not included.
2. Assemble the Regulator: Attach the filter membrane to the bottom of the CO₂ regulator.
3. Fill the Cylinder: Add 700g citric acid and 800g baking soda directly into the 5L stainless steel cylinder.
4. Add Water: Tilt the cylinder at a 45° angle and pour in 1000ml (1L) of tap or distilled water.
5. Attach the Regulator: Secure the regulator to the cylinder and monitor the pressure gauge as the reaction begins.
6. Connect Bubble Counter: Fill the bubble counter 3/4 full with water and attach it to the regulator. Connect the included CO₂ tubing.
7. Complete the Setup: Connect tubing to the diffuser, using the U-bend connector to route it neatly into the aquarium. Secure with suction cups.
8. Adjust Flow: Control CO₂ output using the bubble counter. A typical rate is around 1 to 1.5 bubbles per second—higher rates will deplete the mixture more quickly.
   

Includes:

• 5L stainless steel CO₂ generator tank
• Wyin Aqua precision CO₂ regulator with pressure gauge
• 12V DC solenoid valve for timer-based control
• Aluminium bubble counter with built-in check valve
• Ceramic CO₂ diffuser
• 2 metres of CO₂-resistant 4/6mm tubing
• U-bend hose connector for guiding tubing over the aquarium rim
• Power adapter
• Suction cup holder

Key Features:

• Generates CO₂ using citric acid, baking soda, and water
• Refillable 5L stainless steel tank with polished finish
• Accurate pressure control with regulator and solenoid
• Built-in check valve protects against backflow
• Bubble counter for monitoring and adjusting flow rate (non-quick fill)
• Includes U-bend connector for clean tubing routing
• Easy to refill and maintain with household ingredients