The only things I check daily are to see if any "fell over" or for equipment failure (fogger burnout).

As for PH, I check it on occasion but that really is to check to see if the RO system membrane is still good. I check the TDS on the new water for extra measure, it is usually<30 ppm.

I purge the system weekly, so I mix up the soup, mix it in with the new water and then I wait till it comes down to the operating temperature (64 deg which takes a few hours) then I do a TDS test and adjust the soup if I have to.

I have kept very good notes so I know what my mixtures should be.