Quote:
Originally Posted by ceg4048
The change in tank water pH in relation to the CO2 saturation is irrelevant. You cannot compare the pH change in one tank with the pH change in another tank. That's why a drop checker is used with 4dkh water. It's only the pH change in the drop checker that indicates the level of CO2 saturation. Having said that, a tank water pH drop of .5 is roughly a 3 fold increase in acidity so that is not a small change by any means.
Cheers,
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But to get up to 30ppm with only a .5 difference in pH you would have to start out with 10ppm before adding co2 which at least to me doesn't sound very possible. I could be wrong there about the chances of having 10ppm to start off with, but from what I've read, 4ppm would be on the high end for water that has equalized with the atmosphere. But if the water chemistry is changed in any way between the two pH readings other than adding co2, that will mess up the results of the correlation between pH drop and co2. Someone correct me if I'm wrong, but I was under the impression that x amount more of co2 will always cause the pH to drop x amount irregardless of anything else that is or isn't in the water to start with assuming that's the only variable being played with.
Anyway I was thinking that the pH was 7.1 before adding ANY co2, if that's just in the morning, that's different because you don't know if it's at equilibrium at that point yet or not like Vaughn said.