Neutro CO2 Liquid Carbon - Large

  • Stock: 348 units in stock
  • Dimensions: 2000ml
  • Model: NCOL
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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 not as potent as the gas but is 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.

In addition to this, if you over dose Neutro CO2, it can have a negative effect on algae (it helps reduce it). However you need to take care when overdosing, and increase it slowly. Perhaps 25% extra, then monitor the results. We do not recommend more than double dose.

It is also 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.

DIRECTIONS: Add 5ml per 250L 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 (which is on the better together promotion on the right hand side of the screen).

by Eric P. on 5/9/2019

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

by RUSSELL B. on 10/6/2019

Easy to use. Works great. No need to buy anything else.

by Peter M. on 15/1/2018

I cannot compare with competitor products, but I am completely satisfied with both Neutro CO2 and Aquaessentials service. I would not dream of going anywhere else.

by Ian S. on 27/9/2017

I have been using liquid carbon in my tank now for around 3 months. If you have not tried it, your missing out. Please give it a go.

by Peter W. on 18/9/2017

Excellent - does the job perfectly!

by James T. on 25/8/2017

I use Neutro + in my 450L heavily planted tank. The tank is heavily stocked with Discus, tetras etc so I use it in combination with Neutro and Neutro + even though I use pressurised Co2.. I have had excellent results and the gross feeders like my Amazon Swords are going crazy - I actually have way too much growth but I view that as a good problem to have. The trickier plants like Alanathera and some of the more delicate Crypts are also doing OK, if not quite so vibrant. Apart from the clump, green type algae on my bogwood I have NONE. Really impressive but I do think you will need to use pressurised CO2 to get the best results. After a month or so I splashed out on a dosing pump as adding every day was quite a hassle. I just drilled a hole in the lids and pushed the tubing straight into the 2L bottles. Magic

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.

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