On Jul 17, 12:55*pm, harry wrote:

Buy yourself a water meter. *Fill the pool through the water meter.
Write the number down. *Guaranteed to be exactly correct

Depends on the meter.

My pool also gets deep fast. I just divided it into thirds, which was
close enough to satisfy me.

I suspect the "standard" method is considered "close enough" in the
pool industry.
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- gpsman