For Sale UK

Co2 reactor

4

Co2 reactor for sale on Ireland's largest auction and classifieds sites

Home / Fish & Aquarium / Co2 reactor refurbished & used for sale | For Sale UK
Active co2 reactor - active, sera

Active co2 reactor - active, sera

£60.49 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 scrubber - ph+/co2,

Aquarium co2 scrubber - ph+/co2,

£17.21 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 diffuser - 1/2x,

Aquarium co2 diffuser - 1/2x,

£20.99 · Buy It Now

» View details on eBay #sponsored
Aquarium plants cylinder - plants,

Aquarium plants cylinder - plants,

£59.49 · Buy It Now

» View details on eBay #sponsored
Ista max mix co2 - ista,

Ista max mix co2 - ista,

£12.49 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 diffuser - aquarium,

Aquarium co2 diffuser - aquarium,

£7.71 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - aquarium,

Aquarium co2 generator - aquarium,

£113.99 · Buy It Now

» View details on eBay #sponsored
Colombo co2 reactor pro - colombo,

Colombo co2 reactor pro - colombo,

£10.95 · Buy It Now

» View details on eBay #sponsored
Active co2 reactor - co2, 500

Active co2 reactor - co2, 500

£42.37 · Buy It Now

» View details on eBay #sponsored
Dennerle carbo bio style 120 - style,

Dennerle carbo bio style 120 - style,

£73.99 · Buy It Now

» View details on eBay #sponsored
Aquarium plants cylinder co2 - aquarium,

Aquarium plants cylinder co2 - aquarium,

£47.75 · Buy It Now

» View details on eBay #sponsored
High transparent co2 - high, diffuser

High transparent co2 - high, diffuser

£6.45 · Buy It Now

» View details on eBay #sponsored
Co2 reactor diffuser carbon - co2,

Co2 reactor diffuser carbon - co2,

£19.36 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - aquarium,

Aquarium co2 generator - aquarium,

£70.37 · Buy It Now

» View details on eBay #sponsored
Stainless steel aquarium co2 - steel,

Stainless steel aquarium co2 - steel,

£91.19 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - aquarium,

Aquarium co2 generator - aquarium,

£120.78 · Buy It Now

» View details on eBay #sponsored
Glass co2 diffusers aquarium - glass,

Glass co2 diffusers aquarium - glass,

£5.17 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 scrubber oxygen

Aquarium co2 scrubber oxygen

£25.99 · Buy It Now

» View details on eBay #sponsored
Fzone aquarium co2 - fzone,

Fzone aquarium co2 - fzone,

£169.99 · Buy It Now

» View details on eBay #sponsored
Aquarium plants cylinder co2 - aquarium,

Aquarium plants cylinder co2 - aquarium,

£63.89 · Buy It Now

» View details on eBay #sponsored
Submersible co2 reactor - co2,

Submersible co2 reactor - co2,

£13.99 · Buy It Now

» View details on eBay #sponsored
Aquarium plants cylinder co2 - aquarium,

Aquarium plants cylinder co2 - aquarium,

£41.00 · Buy It Now

» View details on eBay #sponsored
Co2 diffuser fish - co2, tank

Co2 diffuser fish - co2, tank

£6.65 · Buy It Now

» View details on eBay #sponsored
Ozone 0150 oxygen - 0150,, co2

Ozone 0150 oxygen - 0150,, co2

£79.95 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 diffuser - co2,

Aquarium co2 diffuser - co2,

£20.99 · Buy It Now

» View details on eBay #sponsored
Co2 mixer reactor diffuser - mixer,

Co2 mixer reactor diffuser - mixer,

£26.99 · Buy It Now

» View details on eBay #sponsored
Co2gro home brewed co2 - brewed,

Co2gro home brewed co2 - brewed,

£224.95 · Buy It Now

» View details on eBay #sponsored
Aquarium diffuser glass spiral - diffuser,

Aquarium diffuser glass spiral - diffuser,

£6.45 · Buy It Now

» View details on eBay #sponsored
Qanvee co2 diffuser - qanvee,

Qanvee co2 diffuser - qanvee,

£34.65 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - 2.5l,

Aquarium co2 generator - 2.5l,

£120.78 · Buy It Now

» View details on eBay #sponsored
Deltec pf601 calcium reactor - deltec,

Deltec pf601 calcium reactor - deltec,

£516.70 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - aquarium,

Aquarium co2 generator - aquarium,

£57.99 · Buy It Now

» View details on eBay #sponsored
Co2gro home brewed co2 - home,

Co2gro home brewed co2 - home,

£359.95 · Buy It Now

» View details on eBay #sponsored
Legend co2 diffusor external - legend,

Legend co2 diffusor external - legend,

£39.99 · Buy It Now

» View details on eBay #sponsored
Co2 mixer reactor diffuser - diffuser, for

Co2 mixer reactor diffuser - diffuser, for

£25.19 · Buy It Now

» View details on eBay #sponsored
2pcs aquarium co2 generator - 2pcs,

2pcs aquarium co2 generator - 2pcs,

£9.90 · Buy It Now

» View details on eBay #sponsored
Co2 diy reactor bottle - reactor,

Co2 diy reactor bottle - reactor,

£6.35 · Buy It Now

» View details on eBay #sponsored
Glass co2 diffusers - glass,

Glass co2 diffusers - glass,

£5.26 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - 5.5l,

Aquarium co2 generator - 5.5l,

£166.80 · Buy It Now

» View details on eBay #sponsored
Aquarium diy co2 reactor - aquarium,

Aquarium diy co2 reactor - aquarium,

£34.99 · Buy It Now

» View details on eBay #sponsored
Fish tank co2 reactor aluminum - co2,

Fish tank co2 reactor aluminum - co2,

£8.20 · Buy It Now

» View details on eBay #sponsored
Mixer reactor co2 diffuser - mixer,

Mixer reactor co2 diffuser - mixer,

£26.99 · Buy It Now

» View details on eBay #sponsored
Printed reactor for - 3d,

Printed reactor for - 3d,

£25.02 · Buy It Now

» View details on eBay #sponsored
24mm aquarium co2 atomizer - 24mm,

24mm aquarium co2 atomizer - 24mm,

£7.19 · Buy It Now

» View details on eBay #sponsored
Co2 diffusers aquarium - co2,

Co2 diffusers aquarium - co2,

£4.99 · Buy It Now

» View details on eBay #sponsored
4pcs fish tank carbon - 4pcs,

4pcs fish tank carbon - 4pcs,

£10.18 · Buy It Now

» View details on eBay #sponsored
Shaped co2 diffuser for - co2,

Shaped co2 diffuser for - co2,

£6.29 · Buy It Now

» View details on eBay #sponsored
Co2 diy reactor - reactor, bottle

Co2 diy reactor - reactor, bottle

£3.89 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - aquarium,

Aquarium co2 generator - aquarium,

£113.99 · Buy It Now

» View details on eBay #sponsored
Shape glass fish tank - shape,

Shape glass fish tank - shape,

£6.29 · Buy It Now

» View details on eBay #sponsored
24mm aluminum aquarium co2 - aluminum,

24mm aluminum aquarium co2 - aluminum,

£7.19 · Buy It Now

» View details on eBay #sponsored
Co2 diffuser mute easy - diffuser, to

Co2 diffuser mute easy - diffuser, to

£7.31 · Buy It Now

» View details on eBay #sponsored
Fzone aquarium co2 - 4l,

Fzone aquarium co2 - 4l,

£181.99 · Buy It Now

» View details on eBay #sponsored
Fzone aquarium co2 - 2.5l,

Fzone aquarium co2 - 2.5l,

£63.58 · Buy It Now

» View details on eBay #sponsored
Co2 reactor diffuser for - diffuser,

Co2 reactor diffuser for - diffuser,

£32.99 · Buy It Now

» View details on eBay #sponsored
Reactor co2 diffuser - diffuser,

Reactor co2 diffuser - diffuser,

£13.99 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 refinement - 2,

Aquarium co2 refinement - 2,

£7.28 · Buy It Now

» View details on eBay #sponsored
Set 4pcs aquarium co2 - 4/4pcs,

Set 4pcs aquarium co2 - 4/4pcs,

£7.34 · Buy It Now

» View details on eBay #sponsored
10x fish tank plant - tank, co2

10x fish tank plant - tank, co2

£13.52 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - 2.5l,

Aquarium co2 generator - 2.5l,

£138.60 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - 5.5l,

Aquarium co2 generator - 5.5l,

£169.99 · Buy It Now

» View details on eBay #sponsored
Co2 atomizer reactor with - reactor,

Co2 atomizer reactor with - reactor,

£14.60 · Buy It Now

» View details on eBay #sponsored
Set practical co2 - of, 5

Set practical co2 - of, 5

£9.24 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 atomiser - co2,

Aquarium co2 atomiser - co2,

£15.84 · Buy It Now

» View details on eBay #sponsored
5pcs universal co2 diy - 5pcs,

5pcs universal co2 diy - 5pcs,

£8.60 · Buy It Now

» View details on eBay #sponsored
Co2 diffuser bubble atomizer - co2,

Co2 diffuser bubble atomizer - co2,

£8.12 · Buy It Now

» View details on eBay #sponsored
5pcs practical fish - 5pcs,

5pcs practical fish - 5pcs,

£8.32 · Buy It Now

» View details on eBay #sponsored
Co2gro home brewed - -,

Co2gro home brewed - -,

£359.95 · Buy It Now

» View details on eBay #sponsored
4pcs multitools fish tank - fish,

4pcs multitools fish tank - fish,

£9.58 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 diffuser carbon - aquarium,

Aquarium co2 diffuser carbon - aquarium,

£6.29 · Buy It Now

» View details on eBay #sponsored
Set co2 diffuser - set, atomizer

Set co2 diffuser - set, atomizer

£7.06 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 diffuser mute - aquarium,

Aquarium co2 diffuser mute - aquarium,

£8.09 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 diffuser - co2, air

Aquarium co2 diffuser - co2, air

£25.61 · Buy It Now

» View details on eBay #sponsored
New aquarium diy co2 - aquarium,

New aquarium diy co2 - aquarium,

£21.83 · Buy It Now

» View details on eBay #sponsored
4pcs set diy co2 - co2, diffuser

4pcs set diy co2 - co2, diffuser

£13.57 · Buy It Now

» View details on eBay #sponsored
Co2 bubble counter with - co2,

Co2 bubble counter with - co2,

£6.46 · Buy It Now

» View details on eBay #sponsored
Glass co2 diffuser carbon - co2,

Glass co2 diffuser carbon - co2,

£6.29 · Buy It Now

» View details on eBay #sponsored
24mm aquarium co2 - 24mm,

24mm aquarium co2 - 24mm,

£6.83 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 diffuser fish - aquarium,

Aquarium co2 diffuser fish - aquarium,

£14.84 · Buy It Now

» View details on eBay #sponsored
Pcs aquarium co2 diffuser - aquarium,

Pcs aquarium co2 diffuser - aquarium,

£13.68 · Buy It Now

» View details on eBay #sponsored
Co2 diffuser external - co2,

Co2 diffuser external - co2,

£12.90 · Buy It Now

» View details on eBay #sponsored
Acrylic co2 atomizer diffuser - acrylic,

Acrylic co2 atomizer diffuser - acrylic,

£23.39 · Buy It Now

» View details on eBay #sponsored
Aquarium tank diy - aquarium,

Aquarium tank diy - aquarium,

£8.83 · Buy It Now

» View details on eBay #sponsored
Fish tank co2 reactor aluminum - tank,

Fish tank co2 reactor aluminum - tank,

£7.90 · Buy It Now

» View details on eBay #sponsored
Set practical fish - 5, tank

Set practical fish - 5, tank

£9.26 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 diffuser - co2,

Aquarium co2 diffuser - co2,

£24.07 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 diffuser - diffuser,

Aquarium co2 diffuser - diffuser,

£12.78 · Buy It Now

» View details on eBay #sponsored
Co2 diffuser oxygen - diffuser, pump

Co2 diffuser oxygen - diffuser, pump

£6.42 · Buy It Now

» View details on eBay #sponsored
Co2 bubble counter with - bubble,

Co2 bubble counter with - bubble,

£6.38 · Buy It Now

» View details on eBay #sponsored
Aquarium plants cylinder co2 - cylinder,

Aquarium plants cylinder co2 - cylinder,

£71.99 · Buy It Now

» View details on eBay #sponsored
10pcs dia 2cm 3cm aquarium - 2cm/3cm,

10pcs dia 2cm 3cm aquarium - 2cm/3cm,

£10.03 · Buy It Now

» View details on eBay #sponsored
Co2 diffuser acrylic - co2,

Co2 diffuser acrylic - co2,

£8.06 · Buy It Now

» View details on eBay #sponsored
Pcs aquarium plant co2 - pcs,

Pcs aquarium plant co2 - pcs,

£8.35 · Buy It Now

» View details on eBay #sponsored
Aquarium fish tank co2 - tank,

Aquarium fish tank co2 - tank,

£4.62 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - 2.5l,

Aquarium co2 generator - 2.5l,

£121.77 · Buy It Now

» View details on eBay #sponsored
Aquarium co2 generator - aquarium,

Aquarium co2 generator - aquarium,

£6.48 · Buy It Now

» View details on eBay #sponsored

Looking for more co2 reactor?

Search eBay live — fresh results filtered for the best value, updated every hour.

🔍 Search live deals
📊96 listings · from £3.89 · avg £47.97
⚠️ These listings were last updated more than 13 days ago. Search for fresh listings

Browse 96 co2 reactor listings currently in our index. Prices range from £3.89 to £516.7, with an average of £47.97. Whether you are hunting for a bargain or looking for a top-spec model, the selection below covers all price points — new, used and refurbished. More about co2 reactor →

Try this: fish pond filters | jebao | lps coral | marine tank | reef led | return pump | water chiller | parrot fish | pleco cave | zoas wysiwyg

Shop by budget

< £25 £25 – £50 £50 – £100 £100 – £200 £200 – £500 > £500

Everything you need to know about co2 reactor

Whether you are looking for a brand-new or second-hand co2 reactor, eBay offers one of the largest selections available online. With 96 active listings at the time of this page's last update, you have plenty of choice across different conditions, sellers and price points. The cheapest option currently starts at £3.89, while premium listings can reach £516.7 — giving you a wide budget spread to work with. The average price of £47.97 can serve as a useful benchmark: listings below this tend to be used or auction-style, while those above often include extra accessories, warranties, or are sold by professional sellers with high feedback scores. Always check the seller's feedback rating and return policy before committing to a purchase. If you need the item quickly, filter by "Buy It Now" to avoid the uncertainty of auctions. For used items, look closely at the condition description and photos — terms like "good", "very good" and "like new" can mean very different things depending on the seller.

🔍 co2 reactor Search live on eBay