Bubble counter is indispensable with any Co2 setup because it helps to estimate the amount of Co2 injected. Therefore, it is crucial to maintain the correct Co2 levels. Excess CO2 levels can lower the pH level dramatically and severely stress your fish. Under-dosage of Co2 will affect the growth of plants
Compatible with pressurized Co2 tanks & DIY yeast bottles
To setup:
Fill the bottle with water
Connect the Co2 tubing to the inlet of the bottle
Co2 gas from the pipe will create bubbles in the water
Count the number of bubbles per second to estimate the amount of Co2 injected
i got this from a website but i count them per minute