MagTool 2025 Upgraded 2.5-5L DIY Aquarium CO2 Generator Kit, Stainless Steel Bottle with Integrated Solenoid & Bubble Counter, Safety Valve, Main Switch, Complete Accessories for Planted Tanks
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Availability:
In Stock.
Arrives
Tuesday, Sep 8
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Size: 2.5L
Features
- Upgraded 304 Stainless Steel Bottle with External Thread. Made from food-grade 304 stainless steel, now 50% thicker for enhanced durability. The 2.5L bottle holds 200300g of material, and the 5L holds 600800g. External thread design prevents the bottle from getting stuck due to residue buildup. High-pressure resistant with a mirror-polished finishbuilt for both safety and aesthetics.
- Upgraded All-in-One Integrated Solenoid & Bubble Counter. Redesigned compact body with fewer connections reduces leak risk. Features a built-in injection port for easy observation fluid refill without disassembly. Simple, reliable, and space-savingideal for planted tanks.
- Upgraded Dual Safety Mechanism. Equipped with a manual shut-off valve for full control when CO2 is not needed, and an automatic pressure relief valve that vents safely when internal pressure exceeds the safe limit.
- All Accessories Included Ready to Use. Everything you need to get started: diffuser, check valve, U-connector, suction cups, tubing, funnel, syringe, ceramic disc, sealing rings, and power adapter. No need to purchase extra parts separately.(Row material not included)
- One-Year Warranty on Key Components. We stand behind our quality. The upgraded model comes with a 1-year warranty on essential components like the solenoid valve and regulator to ensure long-term peace of mind.
Description
Dedicate to offering efficient & premium quality products for your aquarium water treatment. This CO₂ generator uses a citric acid and sodium bicarbonate reaction to produce high-purity CO₂, delivering stable pressure and flow through a regulator, bubble counter, and diffuser—ideal for boosting plant growth. 2025 Upgrades: Solves Stuck Bottle Issues. Traditional Internal Thread – Often Gets Stuck After Use Manual Shut-Off for Easy Control – Pressure Relief Valve Automatically Vents When Overloaded More Compact Structure, Easier Operation No Disassembly – Fill Easily via Built-In Port
Color: Grey
Brand: MagTool
Material: Stainless Steel
Item Weight: 1.9 kg
Power Source: Raw Material
Power Source: Raw Material
Item Weight: 1.9 kg
Color: Grey
Material Type: Stainless Steel
EU Spare Part Availability Duration: 1 years
Brand Name: MagTool
Manufacturer: MagTool
Unit Count: 1 Count
Number of Items: 1
Included Components: 1
Warranty Description: 1
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Sep 8
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 5.0L
(Before and after pics of the tank this system is on after only a few weeks) After about 5 years, I finally decided to go for it and pick up a CO₂ kit for my aquariums. After a few different diy kits, this is by far the best. The setup is surprisingly simple — everything comes in the box, and it only takes a few minutes to put together. The DIY fill with citric acid and baking soda is easy and much cheaper than buying pressurized refills. The build quality is excellent. The upgraded 304 stainless steel tank feels heavy-duty, with a polished finish that actually looks great sitting next to the tank. The compact solenoid + bubble counter design is one of my favorite parts: it’s easy to fill, reduces the risk of leaks, and makes maintenance way less of a headache than other setups. Safety is another big plus. The dual safety system with both a manual shut-off and automatic pressure relief valve gives real peace of mind, especially for new users like me. And the included accessories (diffuser, tubing, suction cups, etc.) mean you don’t have to hunt down extras. Overall, this kit is a perfect balance of high quality and user-friendliness. If you’ve ever wanted to try CO₂ but thought it would be too complicated, this system makes it easy, safe, and effective. My plants have already shown noticeable growth, and I couldn’t be happier. Highly recommended.
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Reviewed in the United States on August 21, 2025 by Mark3507
Size: 2.5L
Awesome option for a small tank. This is probably the most economical way to successfully add high pressure CO2 to your nano aquarium. Really easy to follow instructions, and literally everything you need in one box (tank, regulator, power cord, diffuser, check valve, CO2 line, suction cups, you get the picture). So far, I've been running it for a couple of weeks in a 20 long, and I'm having no issues at all.
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Reviewed in the United States on August 7, 2026 by Front Range Aquascapes
Size: 5.0L
Another winner. This is my second unit. I simply love the convenience of the FZone DIY kits. Like the smaller size, this one is solidly built with good solenoid and o seals. The controls are good for fine tuning. Very easy to set up. Remember to open the box and find a sticker that you can stick on the cylinder Excellent product. I also have pressurized CO2, however it is starting to get expensive to fill those and not many places refill those. I feel that Fzone kit is an excellent well built substitute.
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Reviewed in the United States on July 3, 2026 by R. sankaran
Size: 5.0L
I had initial problems with the diffuser when i first purchased. MagTool not only reached out to me to apologize but also sent me a new diffuser of my choice! I lost my sealing rubber ring and they immediately sent me a replacement. Ive been using this kit for 4 months now and it’s worked very well. Good kit to ease into CO2 usage. Very easy to setup and use. Cant express enough how great their customer service is. I now have a 5L and the 2.5L.
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Reviewed in the United States on July 8, 2026 by Brandon
Size: 5.0L
I kinda like the product based on it working as intended and seals correctly. However the aluminum couplings that attach the solenoid and bubble counter are about as weak as hardware possibly can be. A slight amount of pressure when adjusting the location of my tank completely sheered the coupling with a minimal amount of pressure. I would just say be careful with the valve couplings and treat delicately however it is impossible to find a replacement coupling and I will need to buy a whole new solenoid and bubble counter ($30+) when you should just be able to order a coupling for cents on the dollar. Hence why I rated this product so low. It’s infuriating as I spent hours looking for a replacement coupling and they don’t exist. Very disappointed would not recommend.
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Reviewed in the United States on December 7, 2021 by reasonabledoubts
Size: 5.0L
The solenoid gets pretty warm. I haven't been able to use it since my first few attempts the solenoid leaked pretty heavily. I'm guessing there's an o-ring missing, but I didn't see any in the box. Removing the solenoid and manually turning things off works decently. The bubble counter is acceptable and there were no leaks between the bubble counter and the regulator. Tank is holding quite a bit of pressure but it's doing great. This replaced my DIY citric Acid/baking soda method with 2 litterl soda bottle. After I had a bottle explode I decided I better do something safer. I was originally going to get a 5lb co2 tank and regulator but with the pandemic still raging have been having issues finding some place to fill the tank. This so far has been a decent substitute although I would really like it if I can get the solenoid not to leak so heavily. Hopefully, it's o-ring situation and I can find a replacement someplace. *update 5/16/22* Seller reach d out to me about the leaking Solenoid bit. 2 replacement parts later I have the solenoid attached, not leaking, and things are working quite dandy. Original 3 star, but I'll give it a 4 since I do have all the bits working with out leaks and the seller was very responsive with getting replacement parts out.
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Reviewed in the United States on April 18, 2022 by bk
Size: 5.0L
After hours of research on Co2 tank kit, I finally found a “nearly perfect” Co2 tank kit that fit my budget, since I found another even cheaper Co2 tank on Amazon…. Dont go for those brand one that charge you like an arm and a leg. Trust me, you need Co2 if you plan to start a planted aquarium. I’ve always failed to start a planted aquarium without using Co2 and just focusing on aquarium plant. Hella algae and I gave up. This is the first time and I said F it and just get myself a Co2 tank with citric acid and baking soda as a reactant to get Co2. It sounds easy to go to a store and refill your Co2 tank but I’m too lazy and I live in the Bay, and I yelped and found that they charged like $15 to fill up a 4L Co2 tank. So I just use the baking soda and cictric method for a cheaper price and dont have to go anywhere. Baking soda from Arm and Hammer get you like 13.5lb for $12 at Costco. Citric acid is like 6lb for $23 with Milliard. Every reaction, you only need to spend like $5.2 per 4L for Co2 bottle with 450 - 550 PSI. People are really bad with math on here like bruhh, use freaking chatgpt if you are bad at math and chem. To sum it up, to create Co2, for every mole of citric acid you need 3 mole of baking soda. So you need 457g of citric acid and 600g of baking soda with 934mL of water to produce approximately 641psi of Co2. This is based on perfect calculation, usually you will get around 450 - 550 psi of Co2. 1:1.3129 (citric acid, baking soda) Water required to dissolve citric acid: For 457 g of citric acid: 457g/148g/100 mL=3.09× 100 mL=309mL of water Water required to dissolve sodium bicarbonate: For 600 g of sodium bicarbonate: 600g/96g/100 mL=6.25× 100 mL=625 mL of water This is the reason why you need 934 mL of water to dissolve everything correctly. Just plug in different gram of baking soda (sodium bicarbonate) and citric acid to get your required water. Since citric acid is more expensive than baking soda that you can get in Costco, I set the citric acid as a limiting reagent. TLDR; remember 1gram:1.3129gram (citric acid, baking soda) then calculate the required water to dissolve everything! Now you just need to add those baking soda, citric in and shake that stainless steel and add water at an angle. Easy peacy no cap. The diffuser for this suck, so buy a different diffuser from fzone or something. My first time starting and I stare at the freking thing for like 3 hours with no Co2. Keep thinking there is a leak or something but it’s the bad diffuser and searched all on reddit….. get yourself a different diffuser. Also get yourself an alexa outlet or something outlet with a timer that you can control with your phone for your solenoid. Since I use this Co2 tank with a Siesta Method. No algae whatsoever!!! First time I got no freaking algae with this algae and maximum brightness. I got 4 tank and I used hygger and Brite light. Brite light is the best trust me. Easy to set up and can set up when it is turn on in correlation with your Co2 turning on. The Co2 tube is kinda rigid to stick it to the bubble counter. I kinda have to use a lighter and loosen up to tie the nut to the bubble counter. Co2 7-11am on 3-9:00pm on Light 8-12on. 12-4pmoff 4-10 on One hour before light turn on to build up Co2 for the tank so plant can use right away. 1 hour turn off before light turn up so light can use all excess Co2. First time setting my planted aquarium and it grows beautifully without algae. Im obsessed with growing plants now haha. Look at my red lotus before and after photo. It exploded! Oh I also added easy green fertilizer everyday too and no algae compared to the bad thrive NA and flourish excel that kill my snail and shrimp. The CO2 PSI in the photo that I have is after a month of 2bps and still around 300PSI remain. Way better than those refilled Co2 tank.
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Reviewed in the United States on September 25, 2024 by Trung
Size: 2.5L
I am a total newbie to co2 injection for planted aquariums. This looks way more intimidating than it actually is. So far looking really good. Set up was really easy. I allowed the chemical reaction take place over night before hooking it up to my tank, just in case. Tank pressurized nicely with no worries of leaks. Set up the solenoid on a timer and it's looking great. I was considering getting replaceable tanks but figured in thr ling run this would be the most cost effective choice. The quality of everything is well worth it.
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Reviewed in the United States on June 27, 2026 by Jonathan Smith