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Colombo 3 in 1 CO₂ Diffuser - Large


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The Colombo diffuser is a neat, self contained piece of kit that combines style, function and affordability. In a nutshell, a bubble counter, non return valve and ceramic diffuser in one.

The customised ceramic disc, ensures the efficient creation of micro bubbles, which makes your gas go further.

How to use the product:

Colombo’s CO₂ diffuser contains a bubble counter, non-return valve and diffuser in just one unit. The bubble counter enables easy and accurate CO₂ dosage since it is easy to count the big bubbles inside the chamber during adjustment. A non-return valve prevents the aquarium water from being sucked backwards, which is possible when the bottle gets empty, or in case you use a magnet valve to turn off the CO₂ supply during the night.

TIP: in order to ensure perfect adherence to the glass, make sure that the glass is clean and grease-free; apply an ultra-thin layer of Vaseline on the suction pads to ensure adherence.

This diffuser is suitable for tanks up to 300L.

Shipping info

All our products are in stock, ready to ship (unless otherwise stated). Order before 4pm for same day dispatch (Mon-Fri). Prices start at £4.99 for a Tracked 48 Service (up to 5kgs) and £8.99 for Express Delivery via DPD.

Our Delivery Promise To You

If you choose Express Delivery, we will replace any plants that are damaged due to delays. Express Delivery is a fast, trackable, and reliable option with a one hour delivery window. It also ensures that the plants will arrive in the same condition as when they left our facility. If you choose a different postage option, such as Tracked 24 or Tracked 48, you will not be covered for any damages due to delays and will assume the risk yourself if the plants do not arrive in good condition. Express Delivery includes an insurance policy, which may cost more but provides added peace of mind.

Colombo 3 in 1 CO2 Diffuser - Large - Aqua Essentials


  • All In Stock

    Everything you see on the site is in stock, ready to ship. No special orders, no waiting around.

  • Fast Dispatch

    Fast shipping. If you order before 4pm Mon-Fri, we'll ship the same day. Whoooosh.

  • Easy Checkout

    You'll find our checkout smooth and silky for a comfortable shopping experiece. Welcome to First Class :)

Customer Reviews

Based on 3 reviews
Michael Webster

This is the third one I have bought and each time after a couple of days the filter doesn’t allow the air to flow causing a build up which blows the tubing off causing a loud bang and scarring the fish,, really fed up with this product

I am sorry to hear this. This is most unusual. What flow rate have you got? (bubbles per second) are you using pressurised or DIY gas and are you using CO2 tubing or silicone tubing?

William M.

Works well, robust and relatively long-lasting.

William M.

Works well, robust and relatively long-lasting.

We're environmentally friendly

  • 1. Sustainable Packaging

  • 2. Fast Delivery

  • 3. Guarantee

Your plants will be wrapped with recyclable Honey Comb wrap - sounds cool because it is :). It interlocks which means we don't need to use tape either, reducing our impact on the environment.

Not only is delivery fast with DPD Express but it's also green as they offset all the carbon their vehicles produce. Guilt free delivery which we're very proud of...

We guarantee you'll be happy with your order. But if you're not, please contact us so we can resolve. We are 100% here to help and will always do our best to resolve any issues - that's a promise.

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