Please
see this. I do not think it will affect the pH - only the dKH and that you will adjust with dosing. Have you change the ventilation of your house recently (because of tho warm/cold climate outside? Have you been more people (or/and dogs/cats) in the house recently?
I test 6 times a day and I use a waste container - not because of I do not want the water back of acid reasons - just that I do daily small WC this way. The water I get out I replace with new one. I did it as described in the linked thread but my conductivity probe brook so I replace around 60% of the lost water with new saltywater (fmy balling solutions replace the rest)
Sincerely Lasse