Is it normal for FC to plummet during the day?

Quickstep192

Silver Supporter
Jun 30, 2022
101
Annapolis MD
Pool Size
15000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
I tested my FC the evening before last - 7.0 perfect.

Today it’s 3.0 it’s been sunny and hot.

Is it normal for FC to burn off like that in the blazing sun?

CYA is 60. I just added some CYA to bump it to 75.
 
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