There need not be any in the pool, of course. In any case, the answer will depend on the dimensions of the pool which you have chosen not to share - making this an impossible question.
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To discover the number of gallons of water in an 850 square foot pool, we'll need to know the depth of the pool. For a pool with 850 square feet and a known depth in feet, we'll find the volume by multiplying 850 ft2 by the depth in feet. With the answer in hand (and it will be in ft3 because we'll have a volume of water), we can find the number of gallons. There are about 7.48 gallons of water in a cubic foot. By multiplying our volume in ft3 by 7.48 (which is the conversion factor), we'll have discovered the volume of the pool in gallons.
It depends on the size of the pool but 20,000 gallons is pretty common.
Assuming your pool is round about 800 gallons.
264 gallons is the max if it's a blow-up pool.
My pool is 30" by 12' (circle) and it has 2100 gallons of water. My guess is that the 36" high pool would have close to 3000 gallons.