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How many bubbles equals one gram of CO2?

The pressure of the bubble will be water pressure + additional pressure from the surface tension of the bubble. The output pressure should only affect bubble rate not bubble pressure.
 
Lol, I did a google, and the first hit says that a Dennerle co2 bubble weighs an average of 0.125mg
DENNERLE CO2 Bubble Counter Exact

using the 0.125mg as a base, our 2kg FE at 2bps would last 277 days. Which is 35 days less.

Today, I connected a new 2kg FE, and set my bps to 2.5bps. This should last 222 days, so I should need to replace it on 3rd May 2021... lets see how that works out!
I'm a week past this forecast and on the same bottle.
Edit: I was starting to doubt myself, however I changed from in-tank to in-line diffuser at some point so I would have adjusted BPS
 
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