PH Levels - time of day

[joemkraus]

My PH levels measurements vary widely as per the time of day. EG. in the morning when the pool filter has not run for 12+ hours I get almost and 8.0, but in the evening, while pump has run all day and is still running, I get around 7.5.
I tend to believe the evening one as when I put in MA is seems to effect the evening one appropriately.

Is this due to the water standing all night? Curious, as never thought it would make much difference

 

[mknauss]

Is the pool covered overnight?

Have not seen that before.

 

[duraleigh]

pH does NOT vary like that. I don't yet know what the issue is but pH does not bob up and down.

in the morning when the pool filter has not run for 12+ hours I get almost and 8.0

Never take a pool sample when the pump has not been running for 30-60 minutes prior to the test.

 

[joemkraus]

Pool is not covered, and I agree with the comment about the pH should not very. Every night when I measured it is consistent and only changes very slowly but for some reason in the morning it registers higher. OK, I don’t know why the pool pump Hass to be running but I will take your word for it as I said in the pool runs all day and I take the reading in the evening it is consistent. Are you also saying that all test should be done at the pump has been running? I just assumed overnight that it was all mixed up accordingly but maybe I should just do my FC test in the evening also

 

[proavia]

Pool pump has to be running for 30 minutes or more so the water is well mixed. Take a sample from about 18" underwater and from the same physical location each time.