aquanoobie
Member
Hi @dw1305
What I am looking for is how much in ppm CO2 is going to have degassed water at atmospheric 2500 ppm CO2.
Thank you @dw1305 very much for solving it. I was looking for this for some time and finally can see the light. So what is the result in terms of CO2 ppm at a given pH drop. We know from scientific papers and your calculations that atmospheric CO2 levels of ~400 ppm make water equilibrium of ~0.5 ppm. We also know that residential areas may have atmospheric CO2 as high as 2 500 ppm and thanks to you we now know what equilibrium this makes and that is 3.74 ppm. By having this data we can calculate tank CO2 ppm range of a typical pH drop,Hi all,
<"[CO2] = P/KH = 3.87 x 10-4 atm/29.41 atm M-1 = 1.32 x 10-5 M"> which gives you <"3.74 ppm CO2"> when you substitute "3.87 x 10-4" with "2.5 x 10-3".
cheers Darrel
1.6 pH, 19 - 150 ppm CO2
1.5 pH, 15 - 120 ppm CO2
1.4 pH, 12 - 95 ppm CO2
1.3 pH, 10 - 75 ppm CO2
1.2 pH, 8 - 60 ppm CO2
1.1 pH, 6 - 48 ppm CO2
1.0 pH, 5 - 38 ppm CO2
I don't know but these ranges, or inaccuracies, are posible and are dependent on the level of house ventilation function. Also this can explain why some people have success with 1.0 pH drop and others don't unless they go for larger drop.
Last edited: