Wasserpest, The KH from my tap is 8, after a water change, my tank water is at 7. After four to five days in the tank it drops to 5 and stays at that level until my next water change.
The Ph from my tap is 7.4. Aged in the tank its 7.2. I have my controller set to 6.9.
Please note I recalibrated the probe, and its now working correctly.