Assuming your pool is round about 800 gallons.
about 11,500 gallons
How deep is the pool?
36701.2987 gallons is the pool is evenly 4 feet deep.
If the pool is 5 feet deep, the volume will be about 8,500 gallons of water.
Depends on how deep it is!
A round, 16' diameter 4' deep pool has a capacity of about 6,016 gallons of water.
About 26,406 gallons.