What is the recommended maintenance level for hardness in swimming pool water?

The recommended maintenance level for hardness in swimming pool water being 200 - 400 parts per million (ppm) is based on the need to strike a balance that prevents both issues of corrosion and scaling. Calcium hardness is crucial in maintaining the overall stability of the pool water chemistry. If the hardness level is too low, it can lead to corrosive conditions that may damage pool surfaces, plumbing, and equipment by leaching minerals away. Conversely, if the hardness is too high, it may result in scaling, which can cause cloudy water and deposits on surfaces and equipment.

Maintaining the hardness level within the 200 - 400 ppm range ensures that there are enough dissolved minerals to protect the surfaces and equipment, while also avoiding excessive hardness that can complicate water balance and clarity. This range is recommended by pool maintenance professionals and industry standards to promote optimal water quality and enhance the overall swimming experience.