CO2 Drop Checker

28 results
In stock
  • Made of high-quality glass
  • Assembly without any suction cups
  • Facilitates easy determination of the CO2 content
  • Visually very appealing
starting at 16,90
€ 67,60 / liter
In stock
  • Safe determination of the CO2 content
  • No need to mix with aquarium water
  • Can be used in all drop checkers
  • Easy to read
  • Perfect for optimising the CO2 content of an aquascape
starting at 10,90
In stock
  • Made of high-quality glass
  • Visually very appealing
  • Good to read
  • The necessary suction cups are included
starting at 14,90
In stock
  • Made of high-quality glass
  • White interior for clear colour recognition of the indicator solution
  • No distortion of the colour change due to light refraction on the glass
  • Unique, round shape looks very unobtrusive
  • Suction cup included
starting at 12,90
In stock
  • Made of high-quality glass
  • Unique round form, very unobtrusive
  • Facilitates easy determination of the CO2 content
  • The necessary suction cup is included
40%
off
starting at
12,90
7,70
In stock
  • Made of high-quality glass
  • Unique round form, very unobtrusive
  • Facilitates easy determination of the CO2 content
  • The necessary suction cup is included
  • B-stock
In stock
  • Made of high quality glass
  • Appealing drop-design
  • Monitors the carbon dioxide level in the water
In stock, only 11 left
  • Complete Test-Set
  • Including Test Container and Test Solution
  • Comes with black suction cup
CO2 drop checkers for your aquarium

If the plant aquarium is fertilized with carbon in the form of carbon dioxide. A drop checker is used to permanently monitor the CO2 content of the aquarium water. This permanent test consists of a test fluid, which is located inside a container. This container is usually made of glass or acrylic glass and is installed inside the aquarium. The test fluid is in no direct contact with the aquarium water. An air-filled channel is located between the test fluid and the aquarium water. CO2 dissolved in the aquarium water diffuses through this layer of air and reacts with the testing fluid, which indicates through its colour an optimal (green), too low (blue) or too high (yellow) CO2 content in the water. In an aquascape or in aquariums with many aquatic plants, concentrations of 20 to 30 mg / l CO2 are aimed at. If the test reagent turns green, this content is reached. Please note that the liquid in the drop checker always indicates the CO2 with a time lag of several hours. In order to combine the green hue with a certain CO2 concentration, the test liquids such as the Aqua Rebel CO2 Check 250 ml have a fixed carbonate hardness.

A measurement of the CO2 content in this way is much more faithful than measuring directly in the aquarium water or calculating with CO2 conversion tables. In both cases, the pH of the water plays a role in determination - and the pH can be influenced, for example, by acids dissolved in the water or by humic substances! That makes these evaluations quite inaccurate.

We offer a vast selection of drop checkers in our online shop. The required testing fluids can be purchased through our webshop as well. The checkers are made of either plastic or glass. Especially the glass checkers are very attractive and fit well into the overall look of an aquascape.

You have trouble filling your drop checker? No problem, we have a guide for you in our Aquascaping Wiki.