Zandor,
What chems are you using for the pH, I am using Nitrogen and phosphorus acids and bases, on low concentrations, I use about 3-6ml at a time, for a 50L res, to control pH, i looked at some pH up and down, but it does not say the chem, or chems used to do so.
So If I read correctly you find that the pH up or down is better than co2. At least for your setup. And since you used co2 before, do you find it disappated into the air fast.

And also I am not automated yet, so i have noticed that i need to adjust my pH every hour or so. Is this common.

If I don't make sense please ask me to clarify.
knowledge Reviewed by knowledge on . using CO2 to control ph I just found out this incredible thing today. Using CO2 to control ph. Mountainman talked about getting a controller to build a ph adjusting machine. Someone posting about using CO2 to control ph. Armed with my new soda club machine ($79 Edition 1) I was ready for the challenge. Today I measured tap water with CO2 and without CO2. The same with R/O water. Seltzer water is plain water injected with CO2. Here are my results. Tap water with CO2 5.4, 5.0, 5.0 5.1 Tap water Rating: 5