jblizzle said:Since generally the pH goes up in most pools over time, and adding a lot of bleach can make it go up some too (temporarily), it is good to start at a low pH so it does not get too high while you are in the shock process and can not test the pH.
Why can't I test the pH while I am in the shocking process?
Or is it unecessary to test anyway if you know the pH before you start shocking and when you are using liquid chlorine?
Also, in my TF100 the ph test only has colour shades for gradations 7.2 , 7.5? I suppose there is no need to be more accurate than this? If the colour is in between do you just gestimate what the ph is when it is between 7.2 and 7.5 I suppose?