I had a CO2 sensor that logged data every hour. I put it in a dirt tank. It was neat to see the cycle of falling and rising CO2 throughout the day.True, for complete CO2 dissolution in a sealed tank with no other CO2 inputs or losses. But that's just a snapshot quantity, not a rate of CO2 input. Now let's estimate the CO2 loss into the air, plant uptake, CO2 production by animals and bacteria ... might need research grade lab paper towels for those calculations ... have at it!