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I changed my 10 lb CO2 tank for my 75g about once a year, with injection rate of about 4 bps, 8 hours a day. Based on my conversion calculation, I am injecting around 10/624.666/365*1000000=43.8 ppm CO2 daily, where 75g water = 624.666 lb.

Assuming 50% off gassing loss, my net CO2 gain is probably no more than 22 ppm. I have glass top that captured some fugitive CO2 thereby reducing off gassing.

How often do you change your CO2 tank.
 

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I changed my 10 lb CO2 tank for my 75g about once a year, with injection rate of about 4 bps, 8 hours a day. Based on my conversion calculation, I am injecting around 10/624.666/365*1000000=43.8 ppm CO2 daily, where 75g water = 624.666 lb.

Assuming 50% off gassing loss, my net CO2 gain is probably no more than 22 ppm. I have glass top that captured some fugitive CO2 thereby reducing off gassing.

How often do you change your CO2 tank.
10 lb co2 filled 4-10-2020. I average 2 bps for 9 hours a day. I have no idea when it's going empty, but maybe I'll update here when it does. :laugh2:
 
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