Nano CO2 Diffusor (L)

Chihiros Nano CO₂ Diffuser (L) – Glass CO₂ Diffuser

The Chihiros Nano CO₂ Diffuser (L) is built for aquariums over 200 litres, where a small diffuser simply can't keep up with the CO₂ demand of a larger volume of water and plant mass. Its larger ceramic membrane pushes more surface area into play, turning pressurized CO₂ into a dense stream of ultra-fine bubbles rather than a trickle of large ones.

What Makes It Different

The core of the diffuser is a ceramic membrane roughly 23 mm in diameter — noticeably larger than the Tiny, S, and M sizes in the same range — which lets it process a higher CO₂ throughput without the bubbles growing coarse or inefficient. Fine, consistent micro-bubbles matter because they dissolve into the water column before reaching the surface, rather than escaping into the air as larger bubbles tend to do.

The body is clear glass, keeping the diffuser visually unobtrusive even in a large display tank where equipment can otherwise clutter the scape. It sits in-tank, held by a suction cup, and connects to your CO₂ line via standard tubing.

Key Benefits

• Large ceramic membrane handles higher CO₂ throughput for tanks over 200 litres
• Ultra-fine, consistent bubbles maximize gas absorption before they reach the surface
• Clear glass construction stays visually unobtrusive in large aquascapes
• Compatible with standard CO₂ tubing and Chihiros regulators and bubble counters
• Doubles as a rough visual bubble counter once filled with water

Who Should Use This

• Aquarists running pressurized CO₂ on large planted tanks (over 200 litres)
• Anyone whose current diffuser can't keep up, producing large, inefficient bubbles under higher CO₂ demand
• Aquascapers who want CO₂ equipment that stays visually unobtrusive in a big display tank

For smaller aquariums, the Tiny, S, or M sizes are a better match — an oversized diffuser on a small tank doesn't add benefit and can be harder to position discreetly.

How to Use

1. Soak the diffuser in clean water for around 30 minutes before first use to fully saturate the ceramic membrane
2. Connect your CO₂ tubing securely to the diffuser inlet
3. Attach the diffuser to the tank glass using the suction cup, positioned in good flow for even bubble distribution
4. Adjust your CO₂ regulator to produce a steady, fine mist rather than large intermittent bubbles

Maintenance

Clean the ceramic membrane periodically to prevent clogging — algae and mineral buildup are the usual causes of larger, less efficient bubbles over time. A dilute bleach solution (roughly 1:10) soak for about 30 minutes, followed by a thorough rinse, restores most diffusers to like-new performance. Handle the glass body gently, as it's more fragile than plastic or acrylic alternatives.

Expert Tip

On larger tanks, don't assume a bigger diffuser alone solves distribution problems — pairing it with good flow from your filter outflow helps carry the fine bubbles across the tank rather than letting them rise straight up in one spot. Position the diffuser in your strongest current for the most even CO₂ spread.

Frequently Asked Questions

What tank size is the L diffuser suited for?

Aquariums over 200 litres, where the larger ceramic membrane can handle the higher CO₂ demand.

Do I need to prepare the diffuser before first use?

Yes — soak it in clean water for about 30 minutes so the ceramic membrane is fully saturated before connecting CO₂.

How do I clean a clogged diffuser?

Soak the ceramic membrane in a diluted bleach solution (about 1:10) for roughly 30 minutes, then rinse thoroughly before reuse.

Is this diffuser fragile?

The body is glass, so it should be handled carefully compared to acrylic or plastic diffusers, though it's durable under normal aquarium use.

Can I use this with any CO₂ regulator?

Yes, it's compatible with standard CO₂ tubing and works with Chihiros regulators as well as most third-party CO₂ systems.

Pairs Well With

• Chihiros CO₂ Indicator – for visual monitoring of dissolved CO₂ levels
• Chihiros CO2 Silicone Tubing – for a secure, leak-free connection
• Chihiros U-Clip – for tidy hose management around the diffuser line