If you’ve installed an under-sink sparkling water dispenser or a 3-way / 5-way faucet from LILIUMFAUCET, you’re already enjoying the refreshing convenience of sparkling water on tap.
But one key component determines how well your system performs — the CO₂ cylinder.
Choosing the right CO₂ tank can improve carbonation quality, reduce refill frequency, and keep your setup running safely and efficiently. This guide will help you understand everything you need to know before buying or replacing a CO₂ cylinder for your home carbonation system.
1. What Is a CO2 Cylinder and Why It Matters
A CO2 cylinder (or CO2 tank) stores compressed carbon dioxide gas that carbonates your water. When connected to your under-sink carbonator, it injects CO2 into your cold water line to create sparkling water.
For home sparkling water systems, always choose food-grade CO2 — it’s purified and safe for beverage use. Industrial or welding CO2 cylinders should never be used, as they may contain impurities.
2. Understanding CO2 Cylinder Sizes
CO2 cylinders come in different capacities, from small 2.5 lb tanks to large 50 lb cylinders. The right size depends on how often you use your system and how much space you have available.
| Size | Approx. Height | Ideal For | Refill Frequency |
|---|---|---|---|
| 2.5 lb | ~14 in | Small households, limited cabinet space | Every 2–3 weeks |
| 5 lb | ~18 in | Families or offices with moderate use | Every 4–6 weeks |
| 10 lb | ~23 in | High-volume users or small offices | Every 2–3 months |
| 20 lb+ | 30+ in | Commercial or shared kitchens | Long-term use |
Liliumfaucet tip: For most home installations, a 5 lb CO2 tank offers the best balance between compact size and long-lasting performance.
If your dispenser allows for longer tubing, your CO2 tank can even be placed up to 15 feet away, for example in a basement or storage area.
3. Connection Types and Compatibility
When purchasing a CO2 cylinder, it is recommended to buy a pressure regulator at the same time. The regulator connects the CO2 tank to the sparkling water machine and controls the carbonation pressure.
The pressure regulator plays a key role in adjusting the level of carbonation. The normal working pressure should be within 100 psi to ensure stable and safe carbonation performance.
The connection size between the regulator and the Liliumfaucet sparkling water dispenser is 5/16 inch.
Before installation, make sure all joints are tightly connected and check for any gas leaks using soapy water or a CO2 leak detection spray.
4. Storage and Safety Tips
Proper handling of CO2 cylinders ensures both safety and long equipment life.
Store upright in a cool, dry, and well-ventilated space.
Avoid direct sunlight, heat sources, or electrical equipment.
Never lay the tank on its side.
Check seals and O-rings regularly for wear or leaks.
Replace washers if you notice hissing sounds or gas escaping.
Don’t refill cylinders yourself — always use an authorized refill service.
Pro tip: CO2 is heavier than air. In closed cabinets, ensure adequate ventilation to prevent CO2 buildup.
5. When to Replace or Refill Your CO2 Cylinder
You’ll know your CO2 cylinder is running low when:
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Sparkling water pressure drops
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Bubbles become weaker
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Carbonation level decreases
When this happens, it’s time for a refill or exchange. Most local gas suppliers, beverage stores, or home brewing shops offer CO2 refill services.
To minimize downtime, many users keep a backup CO2 cylinder — simply swap it when the first runs empty.
6. Recommended CO2 Cylinder Setup for Liliumfaucet Systems
For optimal performance with your under-sink sparkling water dispenser or 3-way/5-way faucet, we recommend:
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Food-grade CO2 tank
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High-pressure rated regulator and hose
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Spare sealing washers or O-rings
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CO2 leak detection spray for quick safety checks
Liliumfaucet products are designed for simple connection with standard beverage CO2 tanks.
Follow the installation manual for detailed setup instructions, or reach out to our support team for personalized assistance.
7. FAQ: CO2 Cylinder Basics
Q: Can my beverage machine be compatible with any type of CO2 cylinder?
A: In principle, yes. However, there is one important condition — the cylinder’s connector must match the beverage machine. As long as the connection fits, there will be no problem.
Q: How long can a 5 lb CO2 cylinder last under normal use, or how much sparkling water can it produce?
A: Generally speaking, it can produce about 60 to 90 liters of sparkling water. However, the exact amount depends on the level of carbonation you prefer — higher carbonation will consume more CO2.
Q: Can I place the CO2 cylinder under the sink?
A: Yes, you can place it under the sink, but there is one important condition — the area where the cylinder is placed must have good ventilation and be kept away from heat sources to ensure safety.
Q: Can I refill the cylinder myself?
A: For your own safety, it’s not recommended to refill it yourself. It’s best to have a certified gas supplier refill your CO2 cylinder following proper safety procedures.
Final Thoughts
A well-chosen CO2 cylinder keeps your sparkling water dispenser working smoothly, giving you perfect bubbles every time.
Take the time to choose the right size, ensure compatibility, and follow simple safety steps — your system will thank you with crisp, refreshing sparkling water at the touch of a button.
Explore our under-sink carbonated water dispensers and 3-way faucets at https://liliumfaucet.com
or contact us at service@liliumfaucet.com for personalized recommendations.
