Customer called us out for main drain back up, tested drainage from inside the house. It was draining good. Customer stated it happened when the backwash was on for the pool so we tried the backwash. The pipe was not perfectly lined up, so it spits out on the side a little bit. ( No issue ) Did perform complementary safety inspection found a couple of issues such as high water pressure and a tankless maintenance. Gave estimates customer is not proceeding with work currently.