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Ok let’s increase to 4.25. Was going say 4.5 but 4.25 is better.
Yesterday I changed the speed of the dosing pumps to 0 (and calibrated again) just after the 3:30pm alkalinity dose. Here are the test results since:
4pm: 8.0KH, adjustment 2%
8pm: 7.9KH, adjustment 6%
12am: 7.9KH, adjustment unknown but assuming 5%
4am: 7.9KH, adjustment unknown but assuming 5%
8am: 8.1KH, adjustment -3%
12pm: 8.1KH, adjustment -3%
4pm: 8.1KH, adjustment -5%
Interesting results, I assume due to the increased accuracy of the dosing speed...
Recalibrate the dosing pumps
Recalibrate the PH probe
Make sure there are no air bubbles, but based on your reading being consistent thinking more calibration and not bubbles.
Double check the tube length and make sure the inputs are corrects for the water sample.
When I did my reference solution I flushed with rodi water 3 times and even did one test with rodi water then did the reference solution.