New pool owner trying to understand test strip reading

Well last year the April showers showed up in July IIRC. No two years are the same but a wet spring is moderately common then the summer is drier. Unless its not.
 
24-48 hours. I used to wait 48 hours because I was surprised (low) once at 24 hours.
Now I don't test after adding for a couple weeks. If it's in there it's in there.
Granted, I use the same brand, and my pool volume is accurate.
 
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