I went to our neighborhood pool and they post the chlorine level daily. It said 2 in the AM. This is a huge pool with a high bather load. And it looks like that is about normal for a commercial pool (1-3) according to the internet. My question is how the heck with the sun all day is that enough chlorine? My pool loses about 4ppm just to sun. Do they have some special chemicals? Any replies are always appreciated.