Helps control the amount of CO2 in tank water: The durable and safe CO2 bubble counter is used in conjunction with the water grass counter. The CO2 gas outlet can be clearly seen to provide enough water for water grass.Keep a better condition for fish and plants - As you know, excessive or insufficient CO2 in the Tank water can cause an excessive load on fish and plants and too much CO2 in the water can cause the pH to drop. Our bubble counter makes aquatic plants happier, healthier, brighter and grow faster.Easy to read: The transparent design of the counter allows you to detect bubbles easily, so you can detect bubbles per second efficiently. Bubbles are formed by CO2 gas in water; the more bubbles, the more CO2. Once the counter is installed and connected, the bubbles should be counted. Safe for plants and fish. The bubble counter is made of premium material, which is durable and reliable. Adding a bubble counter to your aquarium setup is a safe and natural way to add CO2. Quick and easy to install: the bubble counter simply plugs into the existing CO2 diffuser tube. Fill the bubble counter with water, attach it to the hose and attach it firmly to the outer wall of your aquarium with the suction cup provided.