---
product_id: 494510422
title: "Aquarium Co2 System 2L with Pressure Gauge for Aquarium Plants"
brand: "zrdr"
price: "€ 249.44"
currency: EUR
in_stock: true
reviews_count: 9
category: "Zrdr"
url: https://www.desertcart.hr/products/494510422-aquarium-co2-system-2l-with-pressure-gauge-for-aquarium-plants
store_origin: HR
region: Croatia
---

# Upgraded bubble counter with syringe refill Built-in pressure gauge & auto relief valve 2L stainless steel CO2 tank Aquarium Co2 System 2L with Pressure Gauge for Aquarium Plants

**Brand:** zrdr
**Price:** € 249.44
**Availability:** ✅ In Stock

## Summary

> 🌿 Elevate your aquarium’s green game with precision CO2 power!

## Quick Answers

- **What is this?** Aquarium Co2 System 2L with Pressure Gauge for Aquarium Plants by zrdr
- **How much does it cost?** € 249.44 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/494510422-aquarium-co2-system-2l-with-pressure-gauge-for-aquarium-plants)

## Best For

- zrdr enthusiasts

## Why This Product

- Trusted zrdr brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable & Safe Build:** Crafted from premium 304 stainless steel for long-lasting durability and high-pressure resistance, far superior to plastic alternatives.
- • **Precision CO2 Control:** Integrated pressure gauge and automatic pressure relief valve ensure safe, stable CO2 delivery for thriving aquatic plants.
- • **Effortless Maintenance:** Innovative bubble counter with syringe refill lets you top up water without disassembly—no downtime, no hassle.
- • **Enhanced Bubble Efficiency:** Includes atomizer to refine CO2 bubbles for maximum solubility and absorption, boosting plant vitality and aquarium health.
- • **Cost-Effective & Eco-Friendly:** Uses simple, affordable ingredients like citric acid and baking soda—cut recurring costs while supporting sustainable aquarium care.

## Overview

The ZRDR Aquarium CO2 System features a robust 2L 304 stainless steel tank with an integrated pressure gauge and automatic pressure relief valve for safe, consistent CO2 output. Its upgraded bubble counter allows easy water refills via syringe without interrupting operation. Equipped with an atomizer to optimize bubble solubility, this system promotes lush aquatic plant growth. Designed for durability and cost-efficiency, it uses common household reactants, making it an eco-friendly choice for professional aquarium enthusiasts.

## Description

desertcart.com : ZRDR Aquarium Co2 System 2L with Pressure Gauge Automatic Pressure Relief Valve Bubble Counter for Aquarium Plants，Stable Output : Pet Supplies

Review: Using this to make SODA - ZRDR Aquarium Co2 System 2L with Pressure Gauge Automatic Pressure Relief Valve Bubble Counter Purchased 20 May 2024 from ZRDR for $77.99 WARNING: SERIOUS INJURY OR DEATH CAN OCCUR, DON'T DO THIS This is a nonstandard use of the ZRDR CO2 system. This is more of a product suggestion than a review. For the price, this kit is outstanding for the original intended purpose (aquarium) IMHO. This modification is not for the risk adverse, feint of heart, uneducated, nor unskilled. I am merely illuminating what I have done in the hopes that ZRDR will make a professional system for the masses (product suggestion). In the beginning...there was the SodaStream Art by Pepsico. Then I converted this thing to replace the Art and gave the Art away. I just didn't want to fool around with their reasonable $15 60L CO2 canister exchange program, preferring to make my own CO2 from reactants (baking soda and citric acid). I mean come on, making CO2 is cheap and easy. Upfront investment cost is about the same. Recurring costs can be less, providing local access to low cost reactants. At 200g per charge, 5lbs is 2268 grams yielding 11 charges. For convenience, the reactants are sold right here on desertcart: https://www.desertcart.com/gp/product/B000OZFECU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 https://www.desertcart.com/gp/product/B0774M73SF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 This project does require know how and mechanikin' skillz. There are two basic options, modify this canisters OEM top cap permanently destroying the built in regulator and removing everything past and including the bubbler (port in cap for bubbler is 1/8" BSPP), or drill and tap an M30x1.5mm plug using a ~34x28mm O-ring: https://www.desertcart.com/gp/product/B0BCFB7PBV/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Then it's basic plumbing parts until the bottle. I clear Epoxy all plumbing joints. I used two ball valves and a pressure gauge so I could check the canister and bottle pressure, all 1/4" NPT. Then a pressure washer quick disconnect: https://www.desertcart.com/gp/product/B07RHK7HK2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 https://www.desertcart.com/gp/product/B08F2X5L24/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Then drilled a replacement SodaStream bottle cap with 3/8" brad point drill bit then 13/32" and thread with 1/4" NPT tap, appropriate washer threaded 1/4" NPT, epoxy and a 1/4" compression fitting: https://www.desertcart.com/gp/product/B0CZ32LWCC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 And a check valve between pressure washer QD and 1/4 compression fitting: https://www.desertcart.com/gp/product/B0BN6HL5B3/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Then there are two options for the 1/4" stainless tube. From the underside of the bottle cap to the end of tube assembly should be 3+1/2 to 3+5/8 inches long. Easiest was to use a piece of this tube and crimp end in vise for small holes ~1mm: https://www.desertcart.com/gp/product/B0006NAUQK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Fill Sodastream bottle with water to line, chill in fridgedator, screw on and three *quick bursts. NOTE: releasing Sodastream bottle pressure between each burst (I just unscrew bottle from cap). At the end of each burst the bottle pressure should read ~55psi. I should have added a 55psi regulator. This is INHERENTLY DANGEROUS as the Sodastream bottle can be pressurized to way more than 55psi. The second method for the tube assembly that I preferred was to use heavy wall (0.065" wall) stainless 1/4" tube, drill and tap for 3/16-24, then use a vented socket head stainless screw (0.046" hole = 1.1684mm). Both purchased elsewhere. Sodastream bottles and caps here: https://www.desertcart.com/gp/product/B01AHGDQ3Y/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.desertcart.com/gp/product/B004OYMOK2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Amount of CO2 in soda is amazing. I get 6 to 10 1L carbonized Sodastream bottles out of a single baking soda and citric acid charge. At 11 charges that is at least 60 1L bottles carbonized, up to 110. When ZRDR canister pressure drops to below 100psi, I pressurize the Sodastream bottle assembly, then QD and shake vigorously for 10-45 seconds, let sit in fridge for a bit to get more 1L carbonized bottles out of a single charge. This is the reason for the QD and check valve on bottle cap assembly. I like this method for many reasons, the added bonus is it doesn't leak so CO2 waste is minimized. But it lacks a safety release and regulator making it INHERENTLY DANGEROUS. Some notes: I did some research and lots of R&D on this project. What I show here is what I ended up with that IMHO works best. DO NOT use more than 200g of baking soda, 200g of citric acid, and 300g of water in this canister. Pressure will build to 270psi (room temperature) after a couple days unless you use some of the CO2. The canister safety release built into the OEM top cap is advertised for 30Kg/cm2 which is 426psi. My method shown here eliminates that safety release which is DANGEROUS and NOT recommended. I should have added a 300psi 1/4" NPT safety release sold right here on desertcart. Ordinary soda bottles have a burst pressure of 12bar which is 174psi, though there is yielding way before burst, I do not use ordinary bottles. Sodastream bottles are heavy wall and burst has been tested (one unit) at 25bar or 362psi, though there is yielding way before ultimate. Pepsico says this: "To successfully carbonate water with a CO2 tank, the gas regulator valve should be set at 55 PSI, to enable the serving pressure to remain at around 12 PSI." I should add a 55psi regulator, this method is dangerous as the Sodastream bottle could be pressurized way above 55psi. Pepsico advertises 4 years per Sodastream 1L bottle, not cycle dependent. The modification I made to the Sodastream bottle cap invalidates all of this. It would be best if a cap was specially made for this application (product suggestion). edit 23 July 2024 I ended up replacing the vented screw with a 0.8mm misting nozzle. Taking the misting nozzle apart and removing the spring and rubber check valve. This works much better. FYI 0.6mm is too small. https://www.desertcart.com/gp/product/B093L385FF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Also, I purchased a used 5.5L tank elsewhere and added an oxygen regulator, but that bottle needed a smaller o-ring stretched on the M30x1.5mm top cap, 1"ID by 1/8" thick. https://www.desertcart.com/gp/product/B073P1C18S/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Notes: Helps to put glycerin on the o-rings. Helps to put a small 5" balloon in the tank and fill with water (ye old brass hose nozzle) then drop in tank and screw on top cap. Then shake. Balloon comes later for reuse. https://www.desertcart.com/gp/product/B07SR1P15T/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
Review: Easy to install - Use the video on desertcart and you can literally put this together - So far, I like this device and it is super sturdy and looks seriously tech. It really turned out well and was very easy to install. I used the instructions for the dose of chemicals needed, but used the video here on desertcart to get everything connected right. I don't know how many CO2 bubbles I need, but I got it running. You may need a short extension cord which I did as I didn't have it close to a plug outlet. It's a two prong for those of you who want to know. I got it up to the psi that it said and then started putting everything on it like the video showed. I was a little paranoid about cutting the plastic hose air cord but then finally just chose my location which was at the back and figured out where I'd put the in between piece. FYI - the steal curve to hang the plastic didn't work on my tank as it's a black rim 120 gallon and too thick. Luckily, the bubbler piece is heavy so I didn't need it. Oh, make sure the bubbler piece is screwed on snug unless you want a giant bubble which I corrected.. Note - do not put it near an intake as it will fill up your filter with air! I have it on the end with my out take of my canister filter. Fish aren't disturbed by it. I needed CO2 for my plants as I'm getting a lot of algae and my plants needed a kick to grow better. I didn't want to fuss with gas. I admit that my first try sorta failed. I don't know if I mounted the top part with the gasket wrong but it [the gasket] popped out. I lost all of my gas from the first batch and tried again [so buy yourself some big bags of the chemicals or you'll hate yourself and get frustrated], but I used one of the spare gaskets in case the other one was a little odd to try the second time. It's now working perfectly! I am running a serious bubbler with air so that when my lights turn off I don't accidentally hurt my fish. I read that can happen. So far, so good. Once my plants are seriously growing I'll try posting a picture here to show the end results.

## Features

- New upgrade bubble counter: As the water of the co2 generator system bubble counter evaporates quickly, In view of this, we have carried out a new upgrade to the bubbler. The bubble gauge is equipped with a syringe, which can be directly used to inject water (there is a one-way valve inside the generator, only into the water without leakage). And you can also add water during use, no need to close the air outlet, no need to remove the air tube, convenient for your use
- High Security: Automatic pressure relief valve, when the pressure of the inside co2 steel bottle exceeds 30KG will automatically release pressure. 12V Waterproof solenoid valve， Keep away from the danger of water leakage from the solenoid valve, protect your safety
- Refine The Bubbles: Our CO2 aquarium kit is equipped with an atomizer, which can purify bubbles, make them easily soluble in water and absorbed by plants, and make your aquarium full of vitality. We also gave you an extra atomizer as a replacement to extend the service life of the product. When using this product for the first time, there will be large bubbles in the refiner, which will gradually disappear within 3 days
- Low Cost: You only need citric acid, baking soda, and water which are available in supermarkets. When the gas in the bottle runs out, you only need to purchase the material again
- Professional Factory and Peace of Mind After-Sales: We are a manufacturer specializing in CO2 generator systems. Our co2 generator system is made of 304 stainless steel, far better than a simple plastic bottle generator, more durable, stable, safe, and high-pressure resistant. We have a professional after-sales group, Welcome to share with us, if you have any questions

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B9XZMX8L |
| Best Sellers Rank | #92,311 in Pet Supplies ( See Top 100 in Pet Supplies ) #372 in Aquarium Air Pump Accessories |
| Brand | ZRDR |
| Brand Name | ZRDR |
| Customer Reviews | 3.9 out of 5 stars 88 Reviews |
| Included Components | Accessories |
| Item Form | composite |
| Item Weight | 10.58 Ounces |
| Liquid Volume | 2 Liters |
| Manufacturer | ZRDR |
| Manufacturer Part Number | FSQ-Single-zsq |
| Model Number | 2L-Single Gauge-Upgraded |
| Target Species | Aquatic Plants |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** ZRDR
- **Item Form:** composite
- **Item Weight:** 10.58 Ounces
- **Liquid Volume:** 2 Liters
- **Unit Count:** 1.0 Count

## Images

![Aquarium Co2 System 2L with Pressure Gauge for Aquarium Plants - Image 1](https://m.media-amazon.com/images/I/71DTXOK8ApL.jpg)
![Aquarium Co2 System 2L with Pressure Gauge for Aquarium Plants - Image 2](https://m.media-amazon.com/images/I/71lRzJ4PnnL.jpg)
![Aquarium Co2 System 2L with Pressure Gauge for Aquarium Plants - Image 3](https://m.media-amazon.com/images/I/71SLPxDDliL.jpg)
![Aquarium Co2 System 2L with Pressure Gauge for Aquarium Plants - Image 4](https://m.media-amazon.com/images/I/71ZHQxjR2ZL.jpg)
![Aquarium Co2 System 2L with Pressure Gauge for Aquarium Plants - Image 5](https://m.media-amazon.com/images/I/71UWQPoHKuL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Will this system work with growing Cannabis?**
A: It does. That’s what I bought it for. I have a 4x4 tent. With that being said, I would just buy a co2 tank and regulator if I had to do it over. The co2 will only last around 2 hours at 1500ppm. All the mixing required gets old and it’s a sticky mess. But it does work, sorta. Bottom line, save up 300 more and get a real co2 system.

**Q: How tall is whole assembly without the tank base? I have a stand with 17.5 inches of clearance, want to make sure it fits**
A: Not sure but the stand does not add height. I dont think youll make it with 17 inches.

**Q: Will this work on a 150 gallon planted aquarium?**
A: Yes

**Q: which CO 2 generator recommend for a 40 gallon aquarium**
A: I'd use the ZRDR 4L i have it on my 55 been almost a month and still has a good bit of time before empty.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Using this to make SODA
*by 3***O on June 21, 2024*

ZRDR Aquarium Co2 System 2L with Pressure Gauge Automatic Pressure Relief Valve Bubble Counter Purchased 20 May 2024 from ZRDR for $77.99 WARNING: SERIOUS INJURY OR DEATH CAN OCCUR, DON'T DO THIS This is a nonstandard use of the ZRDR CO2 system. This is more of a product suggestion than a review. For the price, this kit is outstanding for the original intended purpose (aquarium) IMHO. This modification is not for the risk adverse, feint of heart, uneducated, nor unskilled. I am merely illuminating what I have done in the hopes that ZRDR will make a professional system for the masses (product suggestion). In the beginning...there was the SodaStream Art by Pepsico. Then I converted this thing to replace the Art and gave the Art away. I just didn't want to fool around with their reasonable $15 60L CO2 canister exchange program, preferring to make my own CO2 from reactants (baking soda and citric acid). I mean come on, making CO2 is cheap and easy. Upfront investment cost is about the same. Recurring costs can be less, providing local access to low cost reactants. At 200g per charge, 5lbs is 2268 grams yielding 11 charges. For convenience, the reactants are sold right here on Amazon: https://www.amazon.com/gp/product/B000OZFECU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 https://www.amazon.com/gp/product/B0774M73SF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 This project does require know how and mechanikin' skillz. There are two basic options, modify this canisters OEM top cap permanently destroying the built in regulator and removing everything past and including the bubbler (port in cap for bubbler is 1/8" BSPP), or drill and tap an M30x1.5mm plug using a ~34x28mm O-ring: https://www.amazon.com/gp/product/B0BCFB7PBV/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Then it's basic plumbing parts until the bottle. I clear Epoxy all plumbing joints. I used two ball valves and a pressure gauge so I could check the canister and bottle pressure, all 1/4" NPT. Then a pressure washer quick disconnect: https://www.amazon.com/gp/product/B07RHK7HK2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 https://www.amazon.com/gp/product/B08F2X5L24/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Then drilled a replacement SodaStream bottle cap with 3/8" brad point drill bit then 13/32" and thread with 1/4" NPT tap, appropriate washer threaded 1/4" NPT, epoxy and a 1/4" compression fitting: https://www.amazon.com/gp/product/B0CZ32LWCC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 And a check valve between pressure washer QD and 1/4 compression fitting: https://www.amazon.com/gp/product/B0BN6HL5B3/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Then there are two options for the 1/4" stainless tube. From the underside of the bottle cap to the end of tube assembly should be 3+1/2 to 3+5/8 inches long. Easiest was to use a piece of this tube and crimp end in vise for small holes ~1mm: https://www.amazon.com/gp/product/B0006NAUQK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Fill Sodastream bottle with water to line, chill in fridgedator, screw on and three *quick bursts. NOTE: releasing Sodastream bottle pressure between each burst (I just unscrew bottle from cap). At the end of each burst the bottle pressure should read ~55psi. I should have added a 55psi regulator. This is INHERENTLY DANGEROUS as the Sodastream bottle can be pressurized to way more than 55psi. The second method for the tube assembly that I preferred was to use heavy wall (0.065" wall) stainless 1/4" tube, drill and tap for 3/16-24, then use a vented socket head stainless screw (0.046" hole = 1.1684mm). Both purchased elsewhere. Sodastream bottles and caps here: https://www.amazon.com/gp/product/B01AHGDQ3Y/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B004OYMOK2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Amount of CO2 in soda is amazing. I get 6 to 10 1L carbonized Sodastream bottles out of a single baking soda and citric acid charge. At 11 charges that is at least 60 1L bottles carbonized, up to 110. When ZRDR canister pressure drops to below 100psi, I pressurize the Sodastream bottle assembly, then QD and shake vigorously for 10-45 seconds, let sit in fridge for a bit to get more 1L carbonized bottles out of a single charge. This is the reason for the QD and check valve on bottle cap assembly. I like this method for many reasons, the added bonus is it doesn't leak so CO2 waste is minimized. But it lacks a safety release and regulator making it INHERENTLY DANGEROUS. Some notes: I did some research and lots of R&D on this project. What I show here is what I ended up with that IMHO works best. DO NOT use more than 200g of baking soda, 200g of citric acid, and 300g of water in this canister. Pressure will build to 270psi (room temperature) after a couple days unless you use some of the CO2. The canister safety release built into the OEM top cap is advertised for 30Kg/cm2 which is 426psi. My method shown here eliminates that safety release which is DANGEROUS and NOT recommended. I should have added a 300psi 1/4" NPT safety release sold right here on Amazon. Ordinary soda bottles have a burst pressure of 12bar which is 174psi, though there is yielding way before burst, I do not use ordinary bottles. Sodastream bottles are heavy wall and burst has been tested (one unit) at 25bar or 362psi, though there is yielding way before ultimate. Pepsico says this: "To successfully carbonate water with a CO2 tank, the gas regulator valve should be set at 55 PSI, to enable the serving pressure to remain at around 12 PSI." I should add a 55psi regulator, this method is dangerous as the Sodastream bottle could be pressurized way above 55psi. Pepsico advertises 4 years per Sodastream 1L bottle, not cycle dependent. The modification I made to the Sodastream bottle cap invalidates all of this. It would be best if a cap was specially made for this application (product suggestion). edit 23 July 2024 I ended up replacing the vented screw with a 0.8mm misting nozzle. Taking the misting nozzle apart and removing the spring and rubber check valve. This works much better. FYI 0.6mm is too small. https://www.amazon.com/gp/product/B093L385FF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Also, I purchased a used 5.5L tank elsewhere and added an oxygen regulator, but that bottle needed a smaller o-ring stretched on the M30x1.5mm top cap, 1"ID by 1/8" thick. https://www.amazon.com/gp/product/B073P1C18S/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Notes: Helps to put glycerin on the o-rings. Helps to put a small 5" balloon in the tank and fill with water (ye old brass hose nozzle) then drop in tank and screw on top cap. Then shake. Balloon comes later for reuse. https://www.amazon.com/gp/product/B07SR1P15T/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

### ⭐⭐⭐⭐⭐ Easy to install - Use the video on Amazon and you can literally put this together
*by M***O on August 21, 2023*

So far, I like this device and it is super sturdy and looks seriously tech. It really turned out well and was very easy to install. I used the instructions for the dose of chemicals needed, but used the video here on Amazon to get everything connected right. I don't know how many CO2 bubbles I need, but I got it running. You may need a short extension cord which I did as I didn't have it close to a plug outlet. It's a two prong for those of you who want to know. I got it up to the psi that it said and then started putting everything on it like the video showed. I was a little paranoid about cutting the plastic hose air cord but then finally just chose my location which was at the back and figured out where I'd put the in between piece. FYI - the steal curve to hang the plastic didn't work on my tank as it's a black rim 120 gallon and too thick. Luckily, the bubbler piece is heavy so I didn't need it. Oh, make sure the bubbler piece is screwed on snug unless you want a giant bubble which I corrected.. Note - do not put it near an intake as it will fill up your filter with air! I have it on the end with my out take of my canister filter. Fish aren't disturbed by it. I needed CO2 for my plants as I'm getting a lot of algae and my plants needed a kick to grow better. I didn't want to fuss with gas. I admit that my first try sorta failed. I don't know if I mounted the top part with the gasket wrong but it [the gasket] popped out. I lost all of my gas from the first batch and tried again [so buy yourself some big bags of the chemicals or you'll hate yourself and get frustrated], but I used one of the spare gaskets in case the other one was a little odd to try the second time. It's now working perfectly! I am running a serious bubbler with air so that when my lights turn off I don't accidentally hurt my fish. I read that can happen. So far, so good. Once my plants are seriously growing I'll try posting a picture here to show the end results.

### ⭐⭐⭐ Nice economic CO2 system for small tanks.
*by T***N on May 14, 2024*

This review is just after 2 days of use, I will update it later. Where I live, I did not find a way to get CO2 bottle refills so I opted for an economic way of producing CO2 while keeping a minimum of control over the diffusion. When I was younger, I used the sugar, yeast and water bottles but it was both unreliable and dirty, now this system is very simple to put together even though the instruction manual do have contradictory illustrations and very bad english translation. Example of issue with the illustration is with the check valve which is shown attached outside the tank on the main page of the user manual but is shown to be installed inside the tank right before the atomizer in a tinny tiny picture next page.. I first installed it outside the tank and everything was working fine with the atomizer making a beautiful mix of tiny and medium bubbles but on second day, the solenoid had shoot water in the line and the atomizer was only shooting medium bubbles from one side only. So I dismounted the line, put it back together with the check valve inside the tank as per instructions but the atomizer is still bubbling from one side only. I will see if it improves over the next 4 days, if not, I will try to use the spare one. Picture are from second day of use. Now, I don't know if anyone at ZRDR ever try the products they provide in the box but the guy who decided to ship a collapsible funnel should be slapped in the back of the head as it is almost impossible to get backing soda powder down the funnel because it sticks to the collapsible part where the silicon like material is. I think I will have to purchase a smooth funnel somewhere else as it makes refilling a tedious task otherwise. Update May, 20th 2024: Since the atomizer would not improve its flow, I switched it with the spare one in the box and it did the same: 1st day almost normal bubbling for a CO2 atomizer except for some big bubbles but even after 4 days, the atomizer is only bubbling big bubbles from only one point. To get it to bubble normally, I must push the CO2 flow to continuous instead of 1 bubble per second. This is ridiculous. The atomizer stones are clearly designed for a higher pressure system. The pressure of my CO2 tank is actually at the top of its capacity and yet... almost no fuzzing bubbles, dropping one more star just for that.

## Frequently Bought Together

- ZRDR Aquarium Co2 System 2L with Pressure Gauge Automatic Pressure Relief Valve Bubble Counter for Aquarium Plants，Stable Output
- Milliard Citric Acid Powder Food Grade, 2 lb Bag, Bulk, 100% Pure Citric Acid Food Grade, Non-GMO Project Verified, Cleaning, Bath Bombs, Cleaner, Descaler, Dishwasher, Candy, Acido Citrico en Polvo
- Milliard 10lbs Baking Soda / Sodium Bicarbonate USP - 10 Pound Bulk Resealable Bag

---

## 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/494510422-aquarium-co2-system-2l-with-pressure-gauge-for-aquarium-plants](https://www.desertcart.hr/products/494510422-aquarium-co2-system-2l-with-pressure-gauge-for-aquarium-plants)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-23*