Assuming your pool is round about 800 gallons.
300 gallons.
How deep is the pool?
This pool can hold a maximum of about 5,707.6 gallons of water.
It depends on how deep the pool is.
how many gallons of water does a swimming pool 15 feet by 4 feet deep hold
This pool can hold up to about 2,538 gallons of water.
This pool can hold a maximum of about 9,403 gallons of water.
5,677 gallons
10,408 gallons.
My answer would be 18.75 gallons
About 2,550 gallons.