MATERIAL: The bubble counter is made of high-quality materials that are durable and reliable. Adding a bubble counter to your aquarium setup is a safe and natural way to effectively add CO2. HELPS CONTROL THE AMOUNT OF CO2 IN THE WATER IN THE SPACE: The durable and safe CO2 bubble counter is used in combination with the aquatic grass counter. The CO2 gas release can be clearly seen in order to provide enough water for the aquatic grass. EASY TO INSTALL: The bubble counter simply connects to the existing CO2 diffuser tube. Fill the bubble counter with water, attach it to the hose, and securely attach it to the outer wall of your aquarium using the provided suction cup. EASILY READABLE: Thanks to the transparent design of the counter, you can easily see the bubbles, allowing you to effectively determine the number of bubbles per second. Bubbles are formed by CO2 gas in the water; the more bubbles, the more CO2. Once the counter is installed and connected, the bubbles need to be counted.