What affects the pH of pool water?
Water, especially in outdoor pools, is exposed to many factors. Pollution falls into it, rainwater falls into it, people bathe in it, chemical reactions take place in it under the influence of the sun. Absolutely everything that comes into contact with the water affects its pH level. We will not go into the chemical nuances. In a nutshell, crystal clear water has a pH level of 7 and everything that comes into contact with it acidifies it or makes it alkaline. And even so, when we use tap water, its 'starter' pH may not be at 7. The water flows through pipes where limescale collects over the years and so, on a 'good day', the water has an altered parameter.