just to inform:
my central air unit has no outside air percentage to its intake. i have opened a window next to the tank, and my ph went from 8.04 to 8.22 in a few hours, and a low of 8.09 over night with the window open. kalk has been stopped and alk was fixed with water changes. i am going to keep the window open 24/7. the apartment has become noticably fresher as well
