I have read here that a free chlorine level above 10ppm will render your pH test inaccurate. I usually test for chlorine and pH twice daily. I add 8.25% Clorox in the evening, shooting for 7.5 to 8.0 ppm. I have noticed that when I test in the morning (when the free chlorine is 7.5 to 8.0 ppm) the pH will be near 7.8. However, when I test in the evening (when the free chlorine is 4.5 to 5 ppm) the pH is usually nearer 7.5. Does a higher free chlorine level actually bring the pH up or is the test not accurate when the free chlorine level is in the 7.5-8.0 ppm range? My pool has been perfectly clear and algae free this year using TFP techniques, thank you!
pH 7.8, fc 7.5, cc .5, ch 100, TA 80, CYA 40
pH 7.8, fc 7.5, cc .5, ch 100, TA 80, CYA 40
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