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FREE refund/replacement until Jan 31, 2026
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Availability:
In Stock.
Arrives
Wednesday, Jan 14
Color: G802S
Features
- 4L large capacityOnce fill, longer use, suitable for medium or large plant tank.
- Right out of the boxNo need to purchase reactants, this kit contains the complete ingredients for one reaction.
- Triple Stainless Steel Filter Element Minimize the failure of solenoid valve.
- 304 Stainless Steel The bottle, regulator and the filter element are all made of high quality 304 stainless steel, more safe and durable.
- Convenient & Worriless 1 second quick plug high quality solenoid valve and bubble counter, low temperature and quiet.
- Filling tips: If you have a kitchen scale, you can add the recommended amount according the bottle neck sticker. If you don't have one, please just put 3A3B reactants which come with the kit and 900 ml water. Both filling methods are safe and feasible.
Brand: Clscea
Liquid Volume: 4 Liters
Item Form: Liquid
Manufacturer: Clscea
Package Dimensions : 15.94 x 12.64 x 5.75 inches; 9.9 Pounds
Date First Available : March 11, 2021
Manufacturer : Clscea
Best Sellers Rank: #74,594 in Pet Supplies (See Top 100 in Pet Supplies) #252 in Aquarium Air Pump Accessories
#252 in Aquarium Air Pump Accessories:
Customer Reviews: 4.3 4.3 out of 5 stars (277)
Item Weight: 9.88 pounds
Manufacturer: Clscea
Date First Available: March 11, 2021
Item Package Dimensions L x W x H: 15.94 x 12.64 x 5.75 inches
Brand Name: Clscea
Target Audience Keyword: Fish
Directions: Fill the bottle with 900 ml of water and the 3A3B reactants that come with the kit. If you have a kitchen scale, you can add the recommended amount according to the bottle neck sticker. The kit contains complete ingredients for one reaction, so there's no need to purchase reactants separately. The product should be used with a 304 stainless steel bottle, regulator, and filter element to ensure safety and durability. The solenoid valve and bubble counter are convenient to use and operate at low temperatures and quietly.
Color: G802S
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Jan 14
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
UPDATE: After buying the Clscea co2 system I came across another “mini” system from Chihiros Aqua which looked high quality so out of curiosity I purchased it to compare. After using both systems for a few days my original 5-star review is validated. The Clscea system blew it out of the water. The Clscea regulator is much easier to dial-in and maintain its setting whereas the Chihiros regulator would constantly change and in some cases completely stop the flow of co2. If you want a budget co2 system it doesn’t get better than the Clscea. I’ve been in the nature aquarium hobby for quite some time and have used CO2 systems that cost quadruple this price. I was very hesitant to try a “DIY” CO2 kit since all of my previous systems were pressurized, but that said, I decided to try this out because my nano tank is only 2g and I didn’t want to spend hundreds of dollars on a CO2 system. When I received the kit I was surprised with the quality the canister and most of the components - the biggest downside is the included diffuser which is made of cheap plastic. While the diffuser does work, I would definitely recommend buying a higher quality diffuser and one sized for your tank. Set-up was really easy however I wish Clscea included a scoop for the ingredients instead of simply instructing you to use "grams". I took another reviewers advice and used a 1/4 cup however I don't think that measurement is entirely accurate so I'd recommend using a coffee scale if you have one. Overall everything went smoothly - just remember to install the inner filter first before screwing on the regulator. Now that I've had the system running for a few days I will say I'm incredibly impressed with how easy it was to set-up and the quality of the solenoid and regulator. Because my tank is so small I needed a really precise regulator to get to ~5-6 bubbles per second and I had zero issues achieving that with this kit. I also have the solenoid on a timer and it works perfectly without any change to the regulator setting after turning back on. Overall I highly recommend this kit (so far) as long as the solenoid doesn't require maintenance too often, that's really the only potential downside. Good news is Clscea does sell parts on Amazon in case you need too replace it. But OOTB for the price I definitely recommend giving this a try.
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Reviewed in the United States on August 1, 2024 by Mad Mensch Mad Mensch
This CO2 system is amazing. I did not realize how small the tank was but it is more than adequate for my 26 Gallon bowfront planted tank. At 1 drop per second which is perfect for this tank (I have C02 indicator in tank) the plants are growing like crazy. All the included parts work perfectly. I did switch over to a thicker CO2 tubing but initially ran it with the included tubing which worked perfectly. Although the adjustment know is sensitive it is not an issue to set it exactly how you want it and it stays put. Lasts 10-12 days before I have to refill with Clcitric acid & baking soda but it uses so little of both that it is extremely cost effective. It does not come with the citric acid or baking soda but I purchased big bags of each on Amazon for dirt cheap. I highly recommend. You can't beat the system for the price. Although a bigger tank would last longer, this is perfect because I can hide the tank behind my stand.
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Reviewed in the United States on September 10, 2023 by David B David B
Color: G802S
Love it, just hours of use and my plants begin to pearl, but I don't get the gauge to operate. Otherwise love it.
Reviewed in the United States on November 16, 2025 by Angel g Escribano
This thing works pretty good. I attached it to a nano tank I have, and the plants have taken off after about the third cycle of use. If you get one, be sure to use it carefully to avoid damaging any of the parts. I spread a towel out on a table when I work on it. A scale would be helpful to measure the dry ingredients to put inside. I mix the ingredients 1 to 1, and it works fine. A newly charged cylinder will last about a month. Besides a scale, a CO2 indicator is a must. The first time I used it, I nearly suffocated my fish because the CO2 was too high. I had to run an air stone on high to help get the CO2 gas out of the water. Anyhow, all is well now and the plants in my tank are growing like crazy.
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Reviewed in the United States on May 11, 2024 by FooBlah
I purchased the 1.3L Aquarium CO₂ System Generator with Regulator Solenoid Valve (G600SMini) for my planted tank, and overall, I’m very pleased with its performance. This was my first time setting up a CO₂ system, but the process was surprisingly easy thanks to the clear written instructions and helpful video tutorial. I also purchased the citric acid and baking soda kit from the same seller, which made the whole setup even more convenient. The system is well-designed, solidly built, and runs smoothly. I initially encountered an issue with the diffuser—it was producing large bubbles from the bottom instead of a fine mist. I contacted the seller (Clscea), and they responded promptly, explaining that the diffuser had likely developed a crack due to stress. They offered to send a free replacement or refund me if I purchased a new one via Amazon for faster delivery. I took the faster route, and true to their word, they refunded the full cost of the replacement without delay. It’s rare to find this level of responsive and thoughtful customer service. Issues can happen, but Clscea went above and beyond to make it right. Highly recommend both the product and the seller—especially for first-time CO₂ system users like myself!
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Reviewed in the United States on June 16, 2025 by Charlie
Color: G802S
The product seems great except the instructions kind of suck with details. Little better than getting other generators that you mix up quick and they last for a week. Tulsa highly dangerous due to the low quality parts on here. My alarms in my house started going off for CO2 but it turns out that the nozzle that the bubbler connects to leaks all the time and if you take that off it doesn't seal it it also just sprays CO2 out so the only way to safely control it is to turn it off which completely makes it useless. Sometimes it is too good to be true and I think I might end up returning this because I'm not going to die in my sleep because the company wanted to use low quality products and make a product that leaks CO2 even when the controller is off. Perhaps another vendor will have a better product.
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Reviewed in the United States on February 22, 2024 by jeffrey E trepanier jeffrey E trepanier