In chemistry, pH is the measuring of the acidity or basicity of a liquid. Normal pH levels of a swimming pool are 7.2 – 7.6.
Keeping normal pH range levels is key when maintaining a pool, among many other things. If the pH becomes too low pH (acidic), this can cause corrosion and scaling on pool surfaces, stainless steel parts, and equipment.
If the pH becomes too high (basic), this can cause water cloudiness, deposits and scaling. Maintaining the pH at a level of 7.4, keeps the chlorine 50% - 60% active. This means algae and bacteria will have a harder time growing.