For me I have to keep my alkalinity up around 11-12 dkh in order to keep my pH up in the 8.0- 8.2 range. There is so much carbon dioxide in my house (especially in the winter) that if I let my alkalinity fall down to 7-8 my pH will also drop to 7.6-7.8
I do everything from drawing my skimmers air from outside to dosing kalkwasser in conjunction with my Calcium reactor to growing macro algae and leaving the top of my system open for better gas exchange. But still I fight with low pH.
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