Why is Ph climbing?

[waterbear]

Then explain to me why the TA increases when CO2 injection is used for pH control (and also why it causes an increase in TA in planted aquariums). Also if this is the case and the TA is lowered when the acid is added that would mean the 'slug method' works'. It would seem that by outgassing CO2 you have actually lowered the amount of the buffer system in the water since you have removed one of it's components. It would seem in the example that it was accounting for a slight increase or decrease in CO2 due to respiration and the effect is what would be expected with a buffer system. I do not believe in a stiuation where you have a forced continuous gassing off would be the same thing at all. YOur comments?