Size Gallons / Liters Perimeter Pool Area 16' x 28' 12,900 / 48,800 73' 349 SqFt 16' x 32' 14,600 / 55,300 81' 397 SqFt 18' x 31' 16,300 / 61,700 81' 429 SqFt 20' x 35' 19,700 / 74,600 91' 532 SqFt 22' x 39' 24,400 / 92,400 102' 658 SqFt