Neutro CO2 Liquid Carbon - Large

  • Stock: 1186 units in stock
  • Dimensions: 2000ml
  • Model: NCOL
Price: £29.99 £25.9913% off
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Better together


Neutro CO2 is a liquid source of carbon for the planted aquarium.

For those of you not familiar with it, carbon is essential for all healthy plant growth and can be provided via gas, or liquid. The liquid form is less potent than gas but still very effective. It won't make your plants pearl (this is when you see O2 bubbles coming from the plant) but it will help them grow. Plants that have access to liquid carbon will do far better than those without.

What happens when plants don't have access to carbon?

Tap water has zero carbon in it so if you're not adding any to the water you can safely assume you have no carbon at all. So if you're not dosing it, plants will not photosynthesize as they should. As a result, they stop growing (or show stunted growth) and can't compete with algae for nutrients and the downward spiral begins. If this carbon deficiency continues, plants inadvertently (out of their control) release sugars and other nutrients which attract algae and it's these sugars and nutrients they so desperately need, but just can't hang onto.

It's a bit like vomiting (sounds gross but true). Without carbon, plants lose energy, nutrients, health and well-being. Their colours disappear. The end result? Algae everywhere.

So you can see why it's actually very important to dose carbon and why we recommend that all plants receive a daily dose because, without it, they will always struggle.

So the sooner you dose liquid carbon the better.

Can I double dose if I have algae?

You can - for short periods but no more than double. It's important to understand that if you do have algae, your tank has an imbalance and this isn't just down to carbon, it's other nutrients versus the amount of light you are pumping in.

Can I spot treat?

It is possible to spot treat plants or wood that have algae growing on them. Simply by using a pipette and extracting some Neutro CO2, squirt the carbon onto the plant or wood when it is outside of the water. Wait for 10 seconds then put it back into the water. You can also do this when performing a water change (it's easiest that way). But if you leave liquid carbon on for too long you will kill the plant.

DOSAGE: Add 1ml per 50L every day. It doesn't matter what time of day you dose this product, but it does need to be added every 24 hours.

Bottle sizes: Small = 500ml,  Medium = 1000ml,  Large = 2000ml

The bottles has a cap which measures 10ml. In order to dose, you can pour directly into that or use one of our dispensing bottles.

by Ray E.
Purchased the larger size after good success with the smaller size combining this with neutro T. Better than faffing around with a pressurised system and good results

by Andrew K.
I love this stuff. Before using this we had all sorts of algae trouble and unhealthy plants despite a CO2 reactor, etc. Using this has transformed it into something much more I hoped it would look when I set it up. It’s easy to use and a canister lasts me a long time.

by Richard S.
Ordered the large Co2 to supplement the liquid feed i also ordered. Delvery was supereb and fast and goods arrived undamaged. Would like to see a nozzle on the containers to assist in dispensing the liquid. I have decanted into smaller bottles to make it easier to dose.

by Mike A.
Trialing in conjunction with Neutro T.

by keith r.
what can you say, product is good and does the job. Would be great if it was a little cheaper, or if purchasing fertilizer as well, then a reduction for both would be better

by Eric P.
Same as review for the fert. More economical and better for the environment.

Ask a question about this product
Hi, a) Can you use this product together with gas CO2? I have the most basic Tetra CO2 system... b) Will a drop checker reflect all the CO2 in the water including that added by liquid or does it only reflect the gas-injected CO2?

Absolutely yes. However liquid carbon has no effect on pH so will not effect your drop checker.

If I purchase Neutro CO2 do I also need to purchase Neutro T? Wasn't sure if I needed both.


Yes. Unless you have a pressurised CO2 system then you need Neutro+

Does this have a shelf life expiry? I bought a large one a year ago and have only just started getting back into the aquatics scene. Recommend buying a new one or safe to use the current mixture?


Might still be fine. Depends on conditions it was stored etc. 

I would start fresh.

Is this safe for shrimps?


at the recommended dose, yes

Already using pressurised co2. You recommend this product with neutro . Are these safe for fish. I have tetras, Siamese algae eaters and bristlenose Pleco and shrimps? Thanks


All products we sell are safe for livestock.

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