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Dennerle CO2 Quick Test, Dissolved CO2 Test Kit
SKU: DE-COQT
- The Dennerle CO2 Quick Test is a dissolved CO2 spot-check test kit with results in seconds for planted tanks.
- It is suited for troubleshooting CO2 dosing, verifying a new system, or checking CO2 after making adjustments.
- Each pack contains two tests; results arrive in seconds without waiting for a color to develop over hours.
- It tests dissolved CO2 gas only; liquid carbon fertilizers are not measured, so results reflect true CO2 levels.
Dennerle
German-engineered freshwater excellence since 1966 — premium nano tanks, planted systems, shrimp care, and CO2 solutions.
Spot-Check Test Kit for Dissolved CO2 in Freshwater Planted Tanks
The Dennerle CO2 Quick Test is a simple, fast test kit for measuring dissolved CO2 gas concentration in a freshwater planted aquarium. Each pack contains two tests with results available in seconds — making it a practical tool for one-off verification rather than continuous daily monitoring. Hobbyists reaching for this product are typically doing one of three things: confirming that a newly installed CO2 system is actually delivering gas to the water, troubleshooting a planted tank where CO2 may be too high or too low, or checking CO2 levels after adjusting bubble rate or solenoid timing on an existing setup.
One specification on the product page requires attention before using this test in certain planted tank setups: liquid carbon compounds are not measured. Hobbyists running liquid carbon supplements such as Dennerle Carbo Elixier or similar products alongside or instead of pressurized CO2 will get a result that reflects only the dissolved CO2 gas in the water, not the liquid carbon. For those users, the Quick Test is still useful for measuring the CO2 component of their plant nutrition program, but the result should not be interpreted as the total available carbon in the tank.
For ongoing continuous CO2 monitoring, the Dennerle CO2 Long-term Test Correct or CO2 Special-Indicator is the appropriate solution — both remain in the tank and give a live reading at all times. The Quick Test is the right product when a periodic spot check is all that is needed.
Key Features:
- Simple, fast dissolved CO2 test for freshwater planted aquariums
- Results in seconds — no waiting for color to develop over minutes or hours
- Two tests included per pack
- Tests dissolved CO2 gas only; liquid carbon compounds are not measured
- Ideal for spot checks when setting up a new CO2 system, adjusting bubble rate, or troubleshooting plant growth
- Compatible with all pressurized CO2 systems and BIO CO2 setups
Ideal For:
- Planted tank hobbyists setting up a new pressurized CO2 system who want to confirm CO2 is dissolving into the water before investing in a permanent long-term monitoring solution
- CO2 system users troubleshooting slow plant growth or unexpected algae who want a quick spot check to rule CO2 in or out as a contributing factor before making larger changes
- Aquarium stores looking for a low-cost add-on that pairs naturally with any CO2 diffusor, regulator, or complete CO2 system purchase at the point of sale
Pro Tips:
- Take the water sample from mid-tank depth and mid-photoperiod for the most useful reading. CO2 concentration varies by depth and time of day. A sample taken near the diffusor or at first light — before plants have been actively consuming CO2 for several hours — gives a different reading than a sample taken mid-tank at midday. Mid-column and mid-photoperiod is the most representative snapshot of what your plants are actually experiencing.
- If you use liquid carbon supplements, this test reflects CO2 gas, not total available carbon. Hobbyists using products like Dennerle Carbo Elixier alongside pressurized CO2 should interpret the Quick Test result as the CO2 gas component only. The liquid carbon contribution to plant carbon availability will not appear in the reading.
- Use Quick Test for spot checks; use the Dennerle CO2 Special-Indicator or Long-term Test Correct for ongoing monitoring. The two-test pack is a verification and troubleshooting tool. Once CO2 levels are confirmed in the correct range, a drop checker or long-term indicator left in the tank continuously is the more practical daily monitoring approach.
What's Included:
- 1 pack containing 2 CO2 tests
Specifications:
- SKU: DE-COQT
- Tests per Pack: 2
- Result Time: Seconds
- Measurement: Dissolved CO2 gas only (liquid carbon compounds not measured)
- Compatible With: Freshwater planted aquariums with pressurized or BIO CO2 systems