Easiest way to figure gallons of water in the pool?

Using a fas-dpd test down to .2 during a chlorine addition will get you darn close. Say take FC from 4 to 7 based on what you THINK your gallons are. Use Pool Math to calculate dosage required. If your check an hour later and your FC is either higher or lower than your target, your pool is either larger or smaller than what you calculated it at.
 
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