Hi there, this is my first pool I’ve ever owned and when we started it up, it leaked really bad out of the backwash port. We have a Hayward vari flow xl sand filter. I took the multi port valve off and saw that the spider gasket was worn down. Replaced that and there is still a leak but much smaller. I then went ahead and just replaced the entire mpv assembly with the already glued in spider gasket. The leak is at a trickle now but it still won’t go away. Am I missing something? Thank you!