pH is important for a swimming pool because it determines how acidic or basic the water is. pH levels in pools are typically maintained between 7.2 and 7.8.

This range is considered optimal for swimmers because it prevents skin and eye irritation, and also helps to keep the pool clean by preventing the growth of algae.

If the pH level in a pool gets too low, it can cause skin irritation and redness. It can also cause damage to swim equipment such as pool noodles and swimsuits.

If the pH level gets too high, it can cause eye irritation and cloudy water.

There are a number of factors that can affect the pH level of a swimming pool, including rainfall, evaporation, and chemicals used to treat the water.

Swimming pool owners should test the pH level of their pool regularly and make adjustments as necessary to maintain a safe and comfortable swimming environment.