Easily count the CO2 bubbles
What’s handy about a good aquarium bubble counter is that you can easily count how many bubbles of CO2 you add to your aquarium per second or per minute. This makes it easy to determine how many bubbles of CO2 your aquarium needs.
A guideline I personally use for planted aquariums: 1 bubble per second for a 100-liter aquarium, 2 bubbles per second for a 200-liter aquarium, …
You’ve changed your CO2 cylinder and now you’ve lost the old setting again? No problem, just turn your needle valve on your CO2 pressure regulator until your bubble counter shows the number of bubbles per second or minute you were using before.