What does it mean when the pool ph tests at a 7.2 and then within 2 seconds starts to change before your eyes, rising to an 8.0? The Alk. Is low at a 60 and the chlorine is reading a 2.5.
Ph reading gone crazy
- Thread starter HBorgersen
- Start date
- Jun 22, 2014
- 47,939
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Welcome! 
Hummm... odd. Can you clarify:
- Which test kit you are using and how exactly are you performing the pH test?
- Enter the test kit along with all of your pool and equipment details into your signature as well.
- How do you chlorinate?
- Any new or unusual chemicals been added recently?
We'll get you some answers.
Hummm... odd. Can you clarify:- Which test kit you are using and how exactly are you performing the pH test?
- Enter the test kit along with all of your pool and equipment details into your signature as well.
- How do you chlorinate?
- Any new or unusual chemicals been added recently?
We'll get you some answers.
Sounds like interference from high chlorine.
If you're not using fasdpd, the chlorine might be higher than you think.
If you're not using fasdpd, the chlorine might be higher than you think.
Welcome!
- Which test kit you are using and how exactly are you performing the pH test?
- Enter the test kit along with all of your pool and equipment details into your signature as well.
- How do you chlorinate?
- Any new or unusual chemicals been added recently?
We'll get you some answers.
The test kit is a Taylor liquid reagent kit. I determined that the ph is extremely low. The color was going from a 7.0 to above an 8.0 in under 10 seconds. The pool is an indoor 17,000 gallon pool. We use sodium Hypochlorite to chlorinate and Co2 to lower the ph. We do Muriatic acid drops to deal with high Alk.
I suspect that the chlorine is actually very high.
When the chlorine is very high, the liquid dpd can bleach out and read lower than actual.
High chlorine will combine with the phenol red to make chlorinated phenol red, which is the color that you are probably seeing.
When the chlorine is very high, the liquid dpd can bleach out and read lower than actual.
High chlorine will combine with the phenol red to make chlorinated phenol red, which is the color that you are probably seeing.
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