--- product_id: 513184979 title: "Fzone 2.5 L Aquarium CO2 System Generator Kit for Aquarium Plants Tanks" brand: "fzone" price: "€ 407.21" currency: EUR in_stock: true reviews_count: 13 category: "Fzone" url: https://www.desertcart.hr/products/513184979-fzone-2-5-l-aquarium-co2-system-generator-kit-aquarium store_origin: HR region: Croatia --- # 12V DC solenoid timer control Precision needle valve with bubble counter 1.5mm SUS304 stainless steel, 25% thicker Fzone 2.5 L Aquarium CO2 System Generator Kit for Aquarium Plants Tanks **Brand:** fzone **Price:** € 407.21 **Availability:** ✅ In Stock ## Summary > 🌿 Elevate Your Aquarium Game with Precision CO2 Power! ## Quick Answers - **What is this?** Fzone 2.5 L Aquarium CO2 System Generator Kit for Aquarium Plants Tanks by fzone - **How much does it cost?** € 407.21 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/513184979-fzone-2-5-l-aquarium-co2-system-generator-kit-aquarium) ## Best For - fzone enthusiasts ## Why This Product - Trusted fzone brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision CO2 Control:** Fine-tune your aquarium’s CO2 flow with a professional-grade needle valve and integrated bubble counter to achieve steady 1 bps injection. - • **Corrosion-Proof & Safe:** Built-in check valve prevents water backflow, protecting your system from rust and ensuring consistent performance. - • **Complete DIY CO2 Solution:** All-in-one 2.5L kit includes regulator, safety valve, and bubble counter—engineered for easy setup and long-lasting CO2 generation up to 1 month. - • **Built to Last, Built for Power:** Robust 1.5mm SUS304 stainless steel bottle withstands up to 80kg/cm² pressure for unmatched durability and safety. - • **Smart Scheduling, Maximum Efficiency:** 12V DC solenoid timer lets you automate CO2 injection, syncing perfectly with your aquarium lighting to optimize plant growth and save resources. ## Overview The Fzone 2.5L Aquarium CO2 Generator System is a premium DIY carbon dioxide reactor kit designed for planted tanks. Featuring a 25% thicker SUS304 stainless steel bottle rated for high pressure, a precision needle valve with bubble counter, and a 12V DC solenoid timer for automated CO2 injection, it delivers steady, efficient CO2 flow for up to one month. Its safety valve and anti-backflow check valve ensure reliable, corrosion-free operation, making it the go-to choice for millennial aquarium enthusiasts seeking professional-grade plant growth solutions. ## Description desertcart.com : Fzone 2.5 L Aquarium CO2 Generator System Carbon Dioxide Reactor Kit with Regulator and Needle Valve for Aquarium Plants Tanks : Pet Supplies Review: Awesome CO2 Generator - I have been running this setup on my 29 gallon heavily planted tank for about 6 weeks now. Ive had such a great experience with it that I ordered a 2nd setup for a 75 gallon tank that I am in the process of building. Pros: - High quality parts - Efficient CO2 generation. I have have a half a tank worth of pressure after 6 weeks - Easy to read gauges - All of my plants are growing like weeds. I've already had to trim them twice - The glassware that's included is very nice. - Plenty of length provided for the co2 hose Cons. - The instructions need work. Maybe it was me, but I had a hard time understanding them. I found a very helpful video on YouTube that clarified the math behind the citric acid & baking soda ratios. - The needle valve is very sensitive so you have to be careful to let the bubbles even out after touching the adjuster to get an accurate count. Other notes: - The setup is very tall when built. All the pieces mount vertically as well as the connection for the c02 house. I planned on having it in my cabinet but I didn't account for the bubble counter and hose being on top so it wouldn't fit. - The glass "U" connector is sized for a rimless tank. I had to cut a small notch in my tank to be able to use it. It is an easy modification to do but it something you need to consider. - A smart plug that allows for daily schedules makes controlling the system a breeze. I have it programmed to turn on at 8 am and shut off at 5pm. Running co2 at night is a waste as plants don't utilize CO2 without light. My lights are also on a controlled schedule as well but that's a different topic. Over all, this setup is a great way to get started with CO2 injection without having to drive around a find someone to fill CO2 canisters. It's possible it's more expensive to run long-term, but for me, being able to order citric acid and baking soda on desertcart that will last me an entire year vs lugging a tank to a paint all store is 100% worth it. I hope Fzone decides to make a 1 liter or even a half liter generator that I can use on my nano desktop tank. Review: It's a good tank. - 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. ## Features - Thicker and last longer! Fzone's DIY CO2 bottles last longer and are thicker than average! With a strong interior wall that can hold more raw materials, our bottles are made of 1.5mm thick SUS304 graded stainless steel, 25% thicker than competitors. The Fzone co2 kit aquarium can withstand a max 80kg/cm2 pressure and generates CO2 gas for 1 month at 1bps for 8 hours a day when filled with 300-400g raw materials. Get a longer-lasting and more efficient CO2 solution with Fzone! - Professional DIY kit -- A complete system in 2.5L size bottle, that includes SUS304 stainless bottle, regulator, precision needle valve, and easily adjustable bubble counter. Safety valve will open automatically when the inside pressure exceeds the safety threshold. - High precision--Needle valve with bubble counter. Aquarium specific needle valve provides accurate fine-tuning. Steady 1 bps is achievable. Bubble counter with check valve built-in. It stops water from back flowing into your CO2 tank (protects your CO2 tanks from rust and corrosion) - 12V DC Instead of AC Power: having the solenoid on a timer, you can specify when you want CO2 injection on and for how long - Attentions: the required powders to generate CO2 gas are not included; you will need purchase the citric acid and sodium bicarbonate powders separately. - Customer Service Team：Fzone will offer a round-the-clock service, and you can reach out to us at any time for any product-related concerns. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0B5R18XDV | | Allergen Information | Tree nuts may contain | | Best Sellers Rank | #55,579 in Pet Supplies ( See Top 100 in Pet Supplies ) #196 in Aquarium Air Pump Accessories | | Brand | FZONE | | Brand Name | FZONE | | Customer Reviews | 4.2 out of 5 stars 997 Reviews | | Global Trade Identification Number | 00689323444083 | | Item Weight | 2.36 kg | | Liquid Volume | 2.5 liters | | Manufacturer | FZONE | | Manufacturer Part Number | 2.5 L | | Model Number | 2.5 L | | Number of Items | 1 | | Pet Type | Fish | | Target Species | Fish | | UPC | 689323444083 | | Unit Count | 1 Count | | Warranty Description | 1 year | ## Product Details - **Brand:** FZONE - **Item Weight:** 2.36 kg - **Liquid Volume:** 2.5 liters - **Manufacturer:** FZONE - **Unit Count:** 1 Count ## Images ![Fzone 2.5 L Aquarium CO2 System Generator Kit for Aquarium Plants Tanks - Image 1](https://m.media-amazon.com/images/I/61WHFAHGpsL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: What is the reason for needing a solenoid? How will the system run without one?** A: The solenoid will control the co2 output. When turn off the solenoid, there will not be co2 out from the generator. If without the solenoid, the co2 will keep output. **Q: How long do I have to wait before using the set up in my tank?** A: You can use it as soon as the needle is in the green. **Q: How can i replace the needle valve. Mine is broken alternating between full throttle or 0?** A: This isn’t a replacement part for the co2 generator it’s valve for a co2 tank. I recommend contacting the manufacturer. **Q: For a 4l co2 generator, should i put in 600-800 gram each of material a&b? also do i pour in 300ml water or more? i've read different opinions online.** A: I use 600 ml for the material each and 800 ml of water I freeze the water in try"s that make long round ice cubes the cube are made to put in water bottles ## Customer Reviews ### ⭐⭐⭐⭐⭐ Awesome CO2 Generator *by D***H on November 26, 2025* I have been running this setup on my 29 gallon heavily planted tank for about 6 weeks now. Ive had such a great experience with it that I ordered a 2nd setup for a 75 gallon tank that I am in the process of building. Pros: - High quality parts - Efficient CO2 generation. I have have a half a tank worth of pressure after 6 weeks - Easy to read gauges - All of my plants are growing like weeds. I've already had to trim them twice - The glassware that's included is very nice. - Plenty of length provided for the co2 hose Cons. - The instructions need work. Maybe it was me, but I had a hard time understanding them. I found a very helpful video on YouTube that clarified the math behind the citric acid & baking soda ratios. - The needle valve is very sensitive so you have to be careful to let the bubbles even out after touching the adjuster to get an accurate count. Other notes: - The setup is very tall when built. All the pieces mount vertically as well as the connection for the c02 house. I planned on having it in my cabinet but I didn't account for the bubble counter and hose being on top so it wouldn't fit. - The glass "U" connector is sized for a rimless tank. I had to cut a small notch in my tank to be able to use it. It is an easy modification to do but it something you need to consider. - A smart plug that allows for daily schedules makes controlling the system a breeze. I have it programmed to turn on at 8 am and shut off at 5pm. Running co2 at night is a waste as plants don't utilize CO2 without light. My lights are also on a controlled schedule as well but that's a different topic. Over all, this setup is a great way to get started with CO2 injection without having to drive around a find someone to fill CO2 canisters. It's possible it's more expensive to run long-term, but for me, being able to order citric acid and baking soda on Amazon that will last me an entire year vs lugging a tank to a paint all store is 100% worth it. I hope Fzone decides to make a 1 liter or even a half liter generator that I can use on my nano desktop tank. ### ⭐⭐⭐⭐⭐ It's a good tank. *by K***P on April 24, 2024* 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. ### ⭐⭐⭐⭐⭐ Above and Beyond *by B***T on August 4, 2026* I’ve been using the 5.5L FZONE CO₂ generator on my planted aquarium and have been very satisfied with it. The system holds pressure well, the solenoid works reliably with a timer, and the needle valve allows stable adjustment once dialed in. My plants responded extremely well, well enough that I eventually reduced CO₂ because growth became too aggressive. After a fresh refill, my pressure reached approximately 450 PSI. I contacted FZONE to verify that this was normal, and customer service responded within hours with a clear, detailed explanation confirming that it was expected and safe for this model. That level of support gave me considerable confidence in the product. ## Frequently Bought Together - Fzone 2.5 L Aquarium CO2 Generator System Carbon Dioxide Reactor Kit with Regulator and Needle Valve for Aquarium Plants Tanks - FZONE Aquatic CO2 Glass Drop Checker PH Momitor for Aquarium Plant Fish Tank Test CO2 Kit - Clscea Aquarium CO2 Raw Materials Citric Acid and Baking Soda --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/513184979-fzone-2-5-l-aquarium-co2-system-generator-kit-aquarium](https://www.desertcart.hr/products/513184979-fzone-2-5-l-aquarium-co2-system-generator-kit-aquarium) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-09-18*