PH reading at high FC

swamprat69

Well-known member
Mar 30, 2019
510
Las Vegas, NV
Since my CYA level is about 80-90 I have found it easier to maintain my FC at 9-11 to prevent excessive loss due to Las Vegas sun and high temps. I under stand that PH readings can be difficult to read accurately as FC approaches 10 or above. My question is... are PH readings at this FC level inaccurate with BOTH chemical and digital meter readings or are PH readings on a digital PH meter accurate at this FC level?
 

ajw22

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Jul 21, 2013
26,269
Northern NJ
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Digital pH testers are not affected by high FC.

Read PH - Further Reading for why the Taylor pH test reads high with high FC.
 
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JoyfulNoise

TFP Expert
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May 23, 2015
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Even at those high FC levels the Taylor pH reagents will work. It’s really only above 10ppm FC that you run into issues but, if you do the test quickly enough, you’ll get a perfectly acceptable reading. Above 20ppm, and the test will not work well at all.
 
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