Size Gallons / Liters Perimeter Pool Area 14' x 28' 13,200 / 50,000 99' 489 SqFt 16' x 32' 16,800 / 63,600 111' 609 SqFt 18' x 36' 24,300 / 92,000 123' 745 SqFt 18' x 38' 25,500 / 96,500 127' 745 SqFt 20' x 40' 30,900 / 117,000 135' 897 SqFt 20' x 42' 32,100 / 121,500 139' 957 SqFt