pH is a scale used to measure the level of Acid and Alkaline in your Swimming Pool or Spa/Hot Tub. Optimum pH levels are between 7.2 and 7.8. The natural level for pH in the human body is around 7.3 - 7.4 so the nearer to this level the more comfortable for you.
It is important to maintain the correct pH level as water that is too acidic or too alkaline will cause unwanted chemical reactions. If the water is too acidic, it will cause metal corrosion, etching on surfaces of materials and stinging in the eyes and irritation. It will also cause the Chlorine/Bromine to burn off at a faster rate and the water can turn brown or black. Too alkaline and it will cause scaling on the surfaces of the Pool and plumbing as well as turning the water cloudy and preventing the Chlorine/Bromine from destroying Pathogens.
The balancing of chemicals is an ongoing process as new elements are continuously being added to the water, for example, oils from skin and leaves and dirt. Test your levels weekly (or more often if the Pool or Spa/Hot Tub is frequently being used) to ensure hassle free swimming.
If your pH level is too high, you will need to add pH Minus (Sodium Bi-Sulphate). If your pH level is too low, you will need to add pH Plus (Sodium Carbonate).