why adding chemicals to the pool water is done instead of draining and cleaning

Question

I see a lot of videos of cleaning pools and I don’t understand why heavily dirty pools aren’t just drained instead of adding things to it. Is it cheaper? Aren’t the chemicals harmful? Is the concentration harmful?

In: Other

Answer 1

A modest pool of 24ft x 12ft x 52 inches deep would take over 24 hours to fill using a typical garden hose that flows around 6 gallons per minute, and that water would come in pretty cold, too. Typical cold water temperature is 45-50 degrees Fahrenheit. Much too cold to swim in. This 10,000 gallons of water could cost over $50, assuming 2021 Las Vegas water surcharges.

Repeating for our metrically challenged friends:
A modest pool of 8m x 4m x 1.3m deep would take over 24 hours to fill using a typical garden hose that flows 25 liters per minute, and that water would come in pretty cold, too. Typical cold water temperature is 7-10°C. Much too cold to swim in. This 42,000 liters of water could cost over $50, assuming 2021 Las Vegas water surcharges.