Hi, I am also new to the forum and was about to post a similar question. I moved into a new house last month with an inground pool (my first time owning a pool). I have 5 return valves throughout the pool and after a couple of hours, one of them usually loses steam and eventually stops working. Three of them also lose steam, but after 4 hours or more. One of them seems to last longer than the rest, but does get weaker. Is this normal or a sign of a problem?