How does rain effect swimming pool water?

Aug 6 2018

Rain almost immediately causes the pH (Potential Hydrogen) in the pool water to rise.

As pH goes up, the ability of chlorine to kill germs goes down.

A person’s body has a pH between 7.2 and 7.8, so if the pool water goes outside this range
then swimmers will start to feel irritation of their eyes and skin. A pH below 7.0 is regarded as alkaline and below 7.0 acidic.

Ensuring the pH is kept between 7.2 – 7.8 will both ensure the chlorine's germ-killing power is unlocked while also helping to reduce skin and eye irritation.

Without regular sanitisation, all pools develop bacteria (germs) which pose health risks. Hence rain is one of the factors that tops-up your pool and risks the bacteria growing.