Very interesting thread.
May I ask how to increase gH to about 4dH if our tap water is only 1dH while maintain tank water pH unchanged @6.7?
Tank pH=6.7, dH=2 (TDS 110), kH=4
Tap water pH=7.8, dH=1, kH=2
What will happen doing 50% WC?
If adding limestones TDS of my tank water increased from 110 to 118 within an hour and I noticed kH also being pulled up.
Thank you.