






🌿 Elevate your aquarium game with precision CO2 control—because your plants deserve the best!
The FZONE 2.5L Aquarium CO2 Generator System is a professional-grade DIY kit featuring a robust SUS304 stainless steel reactor bottle, precision needle valve with bubble counter, and a 12V DC solenoid timer for customizable CO2 injection. Designed for aquarists seeking reliable, safe, and efficient CO2 delivery, this system supports steady bubble rates and includes safety features like an automatic pressure release valve. Ideal for enhancing aquatic plant growth, it offers a complete setup (excluding powders) with a one-year warranty and dedicated customer support.






| ASIN | B0B5R18XDV |
| Batteries Included | No |
| Batteries required | No |
| Customer Reviews | 4.3 4.3 out of 5 stars (536) |
| Date First Available | 13 Feb. 2023 |
| EU Energy Efficiency Label | A+ |
| Item Form | Liquid |
| Item Weight | 2.36 kg |
| Item model number | 2.5 L |
| Product Dimensions | 33 x 10 x 35 cm; 2.36 kg |
M**N
FZone 2.5L CO2 Generator
After carrying out a lot of research I decided this system would be the best bang for bucks system for my 120L system. I've been running the generator for 3 months now and I'm really impressed with it. It was easy to set up and the raw ingredients are cheap and easily purchased from Amazon. The powders are added and then the water is added very slowly with the bottle at a 45 degree angle. pouring it slowly slows down the chemical reaction and stops you wasting gas as you screw the regulator on to the bottle. I was getting 2 weeks of CO2 from one charge and when I added a CO2 reactor that figure went up to almost 4 weeks. 4 weeks of CO2 from 200g of acetic and 260g of Bi Carbonate is in my opinion amazing. The regulator is easy to adjust and the solenoid valve works as it should. The kit itself contains everything you need, except the raw materials and a drop checker. These can be picked up cheaply from Amazon. CO2 has made a big difference to my plants and algae growth is virtually zero now. This kit has been the best piece of kit I have bought for my aquarium in a long time. If you want to add CO2 to your system this is a great straight out of the box solution.
M**E
Quality system thats easy to setup
This is excellent. I was wary of complicated systems and setups but on trying this one its an easy mix of citric acid and bicarb and Ive had over a month of CO2 so far. Easy to set up and easy to adjust the bubbles per second. Has made a visible difference to my plants. Green and lush and visibly improved growth. You can put it on a timer easily with the included solenoid. The bottle is top quality too. Excellent set up and super glad Ive added this system to my tank.
M**H
Easy to set up with help of YouTube
Great product, easy to use just the manual was really poor. It never mentioned the solenoid and how to use it, I had to use YouTube and the bent glass but that sits on the tank where the tubes connect is really fragile and not very well made, I broke mine first day. Other than that it’s a great product my plants have doubled in growth.
I**N
Brilliant, works perfect.
The cheapest way as far as im concerned when introducing Co2 to your tank. This is so easy to set up, I purchased this item about two weeks ago and found the diffuser not very good so removed it and purchased an inline diffuser fitted to the outlet pipe close to the filter as possible. I also have the solenoid on a timer so its not running 24hrs, this is a must so you dont hurt your fish. Im running at one bubble every five seconds for eight hours and it works for me and *dont forget to purchase a drop checker*.
L**L
Works great and easy to set up.
I took a while to decide on what would be the best CO2 system for my tank and settled for one where I did not have to keep buying replacement canisters and I could buy the ingredients cheaply on Amazon. I have now been using this for a fair few months and it has been a great addition to my planted tank. It was very easy to set up and with the addition of a couple of YouTube videos made it even easier. The size of the canister is not too large but I still need to think of a way to hide it. Make sure that you put the plastic tubing into hot water first so that you can get a good seal on all the components and you should then have no leakage of CO2. I did buy a different diffuser from Amazon as that seemed to be the only weak point but through my research I knew this beforehand.
A**N
Rubbish! Stay away!
Wouldn't recommend at all. Barely a month in of using and the solenoid has already stopped working. Avoid.
J**O
Good value, Good quality, No leaks.
Great value for money. Feels well made and got it all assembled and running, no leaks everything does what its meant to do and you get everything you need. Although I'd recommend getting a smart plug or plug timer so you can have it switch on/off automatically.
J**R
Mostly good a couple of minor issues
No more worrying about temperature of water because of yeast. A bit of bicarbonate, a bit of citric acid a bit of water. Boom almost instant CO2. My biggest complaint with this are: 1 the instructions. The bottle gives 2 different instructions for measurements on the cylinder, and the paperwork gives a third set of measurements. Luckily there’s a helpful YouTube video that tells you how to fill it properly. 2. The solenoid. This stopped working by about month 2 or 3 meaning it never turned off and bubbles kept leaking out. We had to buy a replacement. However, I’m far happier with the results. It’s no longer trial, error and dumb luck. Exact measurements of part A & B an exact measure of water and you’re guaranteed at least a month of CO2 in your 110l aquarium every time. This is a great set up, just keep an eye on the solenoid and don’t get stressed with the ingredients, watch the YouTube video instead.
J**A
I bought the FZONE 2.5L Aquarium CO₂ Generator System as a gift for my husband, and he absolutely loves it! 🐠💚 He’s really into planted aquariums, and this CO₂ system has made a noticeable difference in how healthy and vibrant the plants look. The setup was straightforward, and the instructions were easy for him to follow. He didn’t need extra tools or complicated tweaks to get it running smoothly. He especially appreciates that the system seems sturdy and reliable — no leaks or messes so far. The bubbles are steady, and it looks like it’s helping the plants grow faster and greener. Overall, this was a thoughtful gift that hit the mark. My husband is very happy with it, and I’d recommend it to anyone looking to boost their aquarium plants without breaking the bank!
K**P
No seal problems, all parts there, instructions are mostly good. If you dont have a scale, you'll need to do a little math. I added 13.8 Tablespoons Baking Soda, and 8.3 Tablespoons Citric Acid with my 300ML water and it seems to be working out... but again do your own math and make sure do NOT take my word for it. It's been a few weeks and my plants seem happy and my fish are alive so those measurements haven't killed my 29G just yet... Anyways, the setup seems ideal and is decent price as far as I can tell. It does the job well, and hasn't failed me yet. Seems like it's decently made so I'm happy with my purchace. Would buy from this seller again. On a final note... buy a CO2 drop checker. I did some math and figured 1 bubble per 2 seconds was good.... now I'm using 4 bubbles per 1 second. It will help you figure out how much to be adding to your tank and save you mental stress trying to guess. Just take it SLOW and figure out what rate gets your checker green fastest and keeps it green without going into the yellow (danger) zone.
プ**ズ
今まではボンベを買って月に一本のペースで交換してましたが今回初めの化学式ボンベを購入しました 重曹とクエン酸(別売り)があれば水を入れて その日の内に添加可能で いい買い物をしました。逆流防止弁とタイマーを別で購入して設置したので ライト エアレーション co2 のオン オフが自動化したので 朝のエサやりと週一の水換えのみなので すごく楽になりました!設置初日なので星4にしときます!
S**G
Super facile a monter grace au video sur Amazon. Ayant le trouvais plus en plus difficile a échanger mes bouteilles de gaz vide je me suis passée en bio. Mon bac a 180 litres et les produits étaient inutile - aucun bulles. Je trouvais cette système production CO2 par mode bio sous pression. Allez - hop - au panier. Livré ce matin, il m'as pris une vingtaine de minutes de montage. 15 minutes âpres le montage en suivant les instructions au video, J'ai démarrée le Solenoid et les bulles sont arrivées bien fin. Un peut de réglage et je pense que je serai très contente de mon achat. Produit de bon qualité. ** Modification d’évaluation: Suite au montage la système a fonctionné sans problème. Je viens de remplir facilement la bouteille pour la deuxième fois ce matin le 6 juillet. L'aiguille est plus au milieu de la partie vert. Je vais surveiller combien de temps pour ce recharge.
D**S
Genial para fomentar el crecimiento de las plantas de acuario
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