One view is that you can use. Because well water is natural water, there is no pollution and it is good for the body. However, if the water quality of well water is not good (which can be judged by water quality testing), it needs to be used with caution to avoid harm to skin and body.
Another view is that it should not be used. The reason is that the water in the swimming pool needs to be treated and disinfected by professional equipment, and it needs to be tested before it can be put into use. Well water has not been disinfected and may not have been tested for water quality, so it is not suitable for swimming.
Therefore, whether the well water in the rural open-air swimming pool can be used depends on the specific situation. Well water can be used for swimming if it is treated and tested to meet swimming standards. If it has not been treated and tested, or does not meet the swimming standards, then it is best to avoid swimming with well water. In order to ensure the safety and health of swimming, it is suggested to follow the second viewpoint, that is, avoid swimming with well water.