I recently bought a home with a pool. I'm trying to backwash the sand filter, but can't figure out how to do it because the backwash return isn't the standard one I've seen in pictures and videos. I have attached a couple pictures for reference. The black pipe closest to the wall is the backwash pipe and measures 5 inches in diameter. The other black pipe (closest to the camera) is, I believe, the sewer line. When I try to backwash, water just comes shooting out of the black pipe closest to the wall.
Can anyone tell me if they are familiar with this setup and how to backwash the pool? Obviously, the typical little blue backwash hose isn't going to fit around that 5 inch black pipe.