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    Is it necessary to blow out air from main drain? Closing pool without main drain shut off valve

    HI, I live in NY/NJ area. This is the first time I own a property with inground pool. I haven been doing a lot of readings and watching YouTubes about pool closing. However, in my current pipe setup, there are no shut off valves. I think I can still blow the air out from return jets if I lower...