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Hey Tex, guess what's rearing it's ugly head again.... NaHCO3!! I know I'm such a :nerd:, LOL. The CO2 guides assume that the only buffer is the carbonate ion. It makes an equilibrium that can shift pH up or down with the CO2 concentration in the water. That's why so many people are afraid when they have soft water (low KH). The buffering capacity is much lower and you can get big pH swings when injecting CO2.

I do take paypal for chemistry lessons too, LOL.

BTW, Sterling congratulations. You are well on your way, much better than I was when I first started. Can't wait to see pics of the set up.
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