CYA remaining 0 after additions

2 lbs would raise it 10 by my calculations, which is just on the edge of the test's margin of error.

If you can dissolve it today, it should show on the test tomorrow.

FYI an autofill is an automatic refill, it knows with the water level drops and adds water to the pool. Useful in environments with a good bit of evaporation (desert).
 
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