FZONE 5.5L Aquarium CO2 Generator System Carbon Dioxide Reactor Kit with Regulator and Needle Valve for 600-800g Raw Material

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.

This is the second FZONE system I have ordered not because the first one was faulty but a second one gives me the of having a pressured system ready to swap immediately the working tank empties. The system is easy to install and use on a daily basis and is easy to clean after each recharge. There is no smell from the unit and appears to be of a high quality that will last. It has been connected to my 250l tank for four months now with no issues. The solenoid is controlled by a PH controller and, with the use of a smart plug switches CO2 injection off at night. This is important as the plants do not use CO2 at night so there is a chance of gassing the fish if it were to run with the lights off. Plant growth is certainly improved and I am now able to grow some stunning specimens of Red Tiger Lilies with some off shoots achieving a height of 18 inches in around a week. The biggest effect is on invitro plants that can double in size in a 24 hour period.

Had my system for three years. Be Very careful when refilling cylinder, wash inside and dry if possible. My Bicarb and citric acid solidified and unable to remove the solid block at least 6 inches thick. This must have happened over a few months with out me being aware. The material (500ml to 600ml) was fitting in cylinder with the 900 ml of water and working until the mix started to splutter heavily when filling with water which was not normal for me, otherwise a good product.

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.

Lovely looking bit of kit, looks good along side the tank. Silent with no smells or leaks. Very easy to put together via YouTube videos and the mix is a breeze. For the 4L version, the optimum mix is 600g citric acid, 780g of baking soda and 900ml of tap water. The funnel and mixing cups that come with this are way too small so I ordered larger sizes for ease of use. The solenoid works flawlessly and the regulator seems good quality too. Co2 was produced through the diffuser in minutes. However a tip here. It takes around 24 hours for the pressure to reach correct operational pressure. I checked on it next morning to find it was releasing far too much co2 into the tank because the pressure had increased overnight. After tho it has settled into a consistent co2 injection. Another tip is to buy a co2 drop checker, which when positioned correctly in the tank gives an accurate indication of co2 levels for plant growth and fish safety. I've also ordered a better diffuser from Amazon which is meant to produce the smallest bubbles. Though to be fair the one the kit came with is perfectly adequate. First time co2 user so hoping to see a vast difference in plant growth and health.

I’ve purchased the FZONE 2.5L Aquarium CO₂ Generator System (with solenoid) three times now, and unfortunately each unit has had some kind of issue. When the system is running properly, it does its job well. It produces stable CO₂, the regulator and needle valve allow decent control, and it’s a convenient DIY-style setup for planted tanks without going full pressurized cylinder. For the price, it’s an attractive option. However, reliability has been inconsistent. I’ve experienced failures with different components across the units, which is frustrating — especially when running CO₂ on a planted tank where stability is important. Overall, it’s functional and affordable, but quality control could definitely be improved. I’d rate it 3/5 — good concept, just needs better durability.

Pros: Easy to use, just add the two ingredients, add water and screw the regulator on. The production of CO2 is instant. The pressure will be high enough after a couple of minutes to allow your to start feeding CO2 but will continue to rise to full pressure over several hours. I think it looks smart. No mess or smell unlike yeast/sugar. Cons: the only thing I would moan about are the instructions are not well written (they have been translated from Chinese into English). Things that stand out: 1. You have to add Citric Acid and Bicarbonate of Soda. The Instructions say add material A/ 200g and material B/ 220g but they don't say which one is which. See below. 2. Instruction do not mention the filter or how to fit it. 3. Gauges on regulator are marked in PSI but instructions mention 1MPa(10KG/CM2) 4. Also, my regulator was faulty (see image) as the output pressure always showed 0psi. It still worked though. Why 5 stars you may ask ? Because their customer service was very good. I told them about the faulty regulator and they sent me a new one from China (took about 2 weeks). I mentioned about the instructions and was told they would look into it ASAP. As for the weight of the ingredients here's a quote from customer service: "Please see the following steps: 1.Mix 200 gram citric acid and 220 gram sodium bicarbonate inside the bottle 2.Add 300ml tap water to the bottle and cap the bottle with the enclosed regulator quickly 3.While the CO2 gas is produced slowly inside the bottle, adjust the needle valve accordingly. It takes approximately 45 minutes for the bubbles to stabilize after each needle valve adjustment 4.If the solenoid is purchased, remove the bubble counter from the regulator (do NOT unscrew the regulator) and attach the solenoid to it. Connect the power cord to the electrical outlet. As gas is continued to generate inside the bottle, adjust the needle valve to the desired bubble count Please feel free to contact us if you have any question or suggestion." I hope this helps someone else.

Very disappointed with this after the regulator failed 11 months in and despite promises from fzone to replace the parts , I still have not received them and despite several contacts I have been without a working c02 setup since Dec 2025, I have had to bite the bullet and purchase from another company the full setup again, shame on you Fzone. Very disgruntled customer

Recensione Generatore di CO2 per Acquario Ho recentemente installato questo generatore di CO2 nel mio acquario dolce densamente piantumato e ne sono estremamente soddisfatto. Il sistema, basato sulla reazione chimica tra bicarbonato, acido citrico e acqua, si è rivelato efficiente ed economico. La bombola da 2,5 litri, una volta riempita, garantisce un'autonomia davvero notevole. La valvola a spillo permette una regolazione precisa del rilascio di CO2, consentendo di adattare il flusso alle esigenze delle piante e alle dimensioni dell'acquario. La presenza dell'elettrovalvola è un valore aggiunto. Collegandola ad un timer, è possibile programmare con precisione gli orari di erogazione della CO2, ottimizzando così la crescita delle piante e riducendo gli sprechi. Vantaggi: Efficienza: La reazione chimica garantisce una produzione costante di CO2. Economicità: La bombola da 2,5 litri offre una lunga autonomia, riducendo i costi a lungo termine. Precisione: La valvola a spillo permette una regolazione fine del flusso di CO2. Flessibilità: L'elettrovalvola consente di programmare gli orari di erogazione. Sicurezza: Il sistema è sicuro e affidabile. Assistenza clienti: Il servizio clienti si è dimostrato celere, gentile, efficiente, preparato e sempre disponibile a fornire supporto. Conclusioni: Questo generatore di CO2 rappresenta un'ottima soluzione per gli acquari piantumati. La sua semplicità d'uso, l'efficienza, la flessibilità e l'assistenza clienti di alto livello lo rendono un prodotto altamente consigliato. Se cercate un sistema di fertilizzazione a CO2 affidabile e conveniente, non potete sbagliare. La proporzione ideale dei reagenti per una bombola di 2,5 litri è la seguente: - 220 gr bicarbonato (da mettere per primo) - 200 gr acido citrico (da mettere per secondo) - 300 ml acqua fredda che rallenta la reazione iniziale dando il tempo di chiudere la bombola con predite minime di pressione. N.B. La bombola possibilmente sarebbe meglio se fosse asciutta. Questa ricetta crea sufficiente pressione per generare CO2 per circa 3/4 settimane a 2 bolle circa al secondo per 8 ore al giorno e lascia poco o nulla di residuo di citrato di sodio nella bombola. Il citrato di sodio si forma naturalmente come residuo della reazione chimica e se è troppo può depositarsi sul fondo della bombola ed è difficile da togliere perché è piuttosto duro. Sebbene, con la poca chimica scolastica che conosco, col calcolo delle Masse Molari il rapporto più efficace tra il reagente, l'acido citrico, e il partner reattivo, il bicarbonato di sodio, sia di 1:1,3 quindi per 200 gr di acido sia necessario circa 260 gr di bicarbonato, ho riscontrato che con questa ricetta si genera troppo residuo duro sul fondo che ho dovuto togliere martellandolo a lungo con un tubo sottile per frantumarlo in pezzi più piccoli. Pertanto suggerisco la ricetta precedente.

I recently invested in FZone’s CO2 Generator System, and I must say, I am thoroughly impressed! The setup process was straightforward, and the system is incredibly efficient. It delivers consistent, high-quality CO2 output, which has noticeably improved my plants’ growth. Since using this generator, I’ve seen healthier, more vibrant plants with stronger yields. The design of the system is user-friendly, with clear instructions and easy-to-understand controls. It also operates quietly and doesn’t require constant maintenance, which is a huge plus for me. The build quality feels solid, and I can tell that FZone has put a lot of thought into creating a durable, reliable product. I also appreciate the energy efficiency of the unit. It doesn’t consume excessive power, making it a cost-effective solution in the long run. Whether you’re a hobbyist or a professional grower, I highly recommend FZone’s CO2 Generator System for anyone looking to boost their plants’ growth and maximize their yields. Truly an excellent investment!

Ich habe mir das Gerät gekauft, um langfristig eine konventionelle CO2-Anlage zu ersetzen und die teuren Flaschenfüllungen und TÜV-Termine zu umgehen. Dazu habe ich gerechnet: Eine Füllung der FZone mit Natriumbicarbonat und Zitronensäure kostet etwa 2,50 Euro (beim Kauf der „Zutaten“ als Sackware und Verwendung in der 4-Liter-Version der FZone). Also auch noch in je einen 25 kg-Sack Natron und Zitronensäurepulver investiert … na ja, kann man ja auch sonst noch gut im Haushalt gebrauchen, das relativiert die hohe Anfangsinvestition etwas. Zum Gerät selber: Die Lieferung erfolgte vor dem angekündigten Termin, die Verpackung ist ordentlich und besteht fast ausschließlich aus Karton (Kunststoff wurde so gut es geht vermieden). Die Verarbeitung wirkt hochwertig und stabil. Das Ding kann man sich auch im Wohnzimmer neben das Aquarium stellen, wenn es z.B. nicht in den Unterschrank passt - mit Blasenzähler, Relais für die Nachtabschaltung und nach oben weggeführtem CO2-Schlauch baut das eher hoch. Das Netzteil für die Nachtabschaltung muss mit einem beiliegenden Adapter an kontinentaleuropäische Steckdosen angepasst werden - auch das geht einwandfrei. An der Nachtabschaltung befindet sich eine rote LED, die leuchtet, wenn die Anlage in Betrieb ist (das Relais angezogen hat). Das ist praktisch und sieht „stylisch“ aus - eine grüne LED (grün = „läuft“) hätte das Ganze noch getoppt. Die Angaben zur Menge von Natron und Zitronensäure sind in der beiliegenden Anleitung und auf dem Flaschenaufkleber unterschiedlich (aber auf Deutsch ;)). Ich habe den Mittelwert genommen und jeweils 700 g eingefüllt. Mit einer Küchenwaage und dem beiliegenden Messbecher ist das einfach. Da es sich bei beiden Substanzen auch um ungiftige „Hausmittel“ handelt, macht es nichts aus, wenn ein paar Krümel danebengehen. Es wird darauf hingewiesen, dass die Flasche nach dem Einfüllen des Wassers schnell verschlossen werden sollte. Ich habe deshalb mit einer starken Reaktion gerechnet, aber die Zeit reicht locker, um den Verschluss sauber aufzuschrauben. Die chemische Reaktion führt dazu, dass sich am Anfang bis zur Füllhöhe außen an der Flasche Kondenswasser bildet. Der Druck baut sich dann langsam auf, nach zwei bis drei Tagen sind trotz laufendem Betrieb 420 PSI erreicht (ca. 30 bar). Es vergehen etwa 12 Stunden, bis der Druck so groß ist, dass die Anlage läuft. Das alles lässt sich an den montierten Manometern gut ablesen. Mit der Druckangabe in PSI werde ich nicht warm, aber das ist Jammern auf hohem Niveau. Die Anzahl der CO2- Blasen, die ausströmen, kann sehr gut am Blasenzähler abgelesen werden. Die Regulierung ist sehr feinfühlig möglich und reagiert direkt, das kenne ich von meiner herkömmlichen Anlage anders. Die Nachtabschaltung funktioniert einwandfrei und dichtet komplett ab. Nachströmendes CO2 oder ähnliche Funktionsstörungen hat meine Anlage nicht. Also: Wer seinen CO2-Dünger fürs Aquarium selber herstellen möchte, eine hochwertig gemachte und einwandfrei und stabil laufende Anlage sucht und die zugegebenermaßen hohe Anfangsinvestition nicht scheut, kann hier zuschlagen. Man muss sich im Klaren sein, dass der Wechsel der „Zutaten“ Arbeit bedeutet (dieser Schritt hat bei mir 15 Minuten gedauert) und sich das Ganze nur auf lange Sicht rechnet. Erfahrungen, wie lange eine Füllung hält, habe ich noch nicht … im Moment ist seit einer knappen Woche kein Druckabfall zu erkennen und ich entnehme zwischen zwei und drei Blasen/Sekunde bei einer Laufzeit von 11 Stunden täglich. Ich hoffe, diese Rezension hilft euch weiter. Edit am 11.02.23: Die Anlage ist heute vier Wochen mit der ersten Füllung in Betrieb. Der Druck ist auf ein knappes Viertel des ursprünglichen Maximums gefallen - in den nächsten Tagen wird also eine Neubefüllung nötig werden. Ich halte mit der Anlage einen CO2-Wert von 20 mg/l in einem 260 Liter-Auarium konstant. Da finde ich eine Standzeit von vier Wochen+ akzeptabel. Positiv ist, dass bei fallendem Druck nicht nachreguliert werden muss, um die Anzahl der ausströmenden Blasen konstant zu halten. Der verbaute Druckminderer ist also auch von guter Qualität. Edit am 04.05.23: Inzwischen läuft an meinem zweiten Aquarium ebenfalls eine FZone. Das oben Geschriebene gilt auch für diese Anlage, die von einigen anderen Rezensenten beschriebenen Probleme tauchen auch hier nicht auf. Die Standzeit hat sich in beiden Anlagen auf 4,5 Wochen bei 20 mg CO2/l im 250 l-Becken eingependelt. Die Neubefüllung dauert jeweils zehn Minuten und ist zur Routine geworden. „Chemieunfälle“ gab es nicht, die Handhabung der Chemikalien ist mit ein wenig Sorgfalt problemlos. Nach Ablauf der chemischen Reaktion kann der Inhalt der Flasche im Ausguss entsorgt werden. Er ist ungiftig und reagiert nicht mehr. Tipp 1: Ein Trichter mit einem WEITEM Auslauf erleichtert die Befüllung mit Natron erheblich. Die Substanz ist sehr feinkörnig und rieselt schlecht, der beiliegende Trichter ist dafür ungeeignet. Die grobkörnige Zitronensäure macht das Problem nicht. Tipp 2: Wenn man die FZone-Flasche während des Betriebs ab und zu schwenkt, lösen sich Zitronensäure und Natron komplett auf. Das erleichtert die Reinigung der Flasche hinterher erheblich. Keine Sorge, es kommt durch das Schwenken nicht zu einer gesteigerten Reaktion mit Überdruck. Ich habe bei der ersten Füllung das Wasser nur zugegossen und die Flasche verschlossen. Die Folge waren große Verklumpungen, die beim Reinigen nicht durch die Flaschenöffnung passten. Auf die Standzeit hat das alles aber keine Auswirkungen.

Très bon produit, permet de faire un geste écologique. On ne jette plus les bouteilles vides. Très facile à régler. Le dispositif est assez grand, bien trouver sa place car peut-être un peu fragile. L’ensemble est esthétique et le rendu des bulles agréable. Pour ce qui des quantités, bien utiliser ceux inscrit sur le haut de la bouteille, 200 grammes et non ceux inscrit sur le site 300-400 grammes. Je n’avais mis que 300 grammes et j’étais dans la zone rouge, j’ai dû vider progressivement la bouteille et la surveiller pendant environ 24 heures avant stabilisation. Peut-être dû à la qualité des produits.

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.