40,000 gallons is approximately 150,000 L, while an Olympic pool is in the area of 1,000,000 L. So around 0.15 Olympic pools — roughly, a football field would

40,000 gallons is approximately 150,000 L, while an Olympic pool is in the area of 1,000,000 L. So around 0.15 Olympic pools — roughly, a football field would fill an Olympic pool in a week.