Pro Tip #3

How do you know when to clean sensors?

pH sensor:
pH sensors are usually very stable and predictable but also require routine calibration to your test kit reading.  Calibration may be needed once a week but more frequent calibration indicates the need for cleaning.

ORP sensor:
ORP levels are based on chlorine levels and consistent pH.  Be sure to clean ORP sensors at the same time as pH sensor.  If you see a trend with ORP levels 30mV different than prior to cleaning, you waited too long.   Adjust cleaning schedule accordingly.