My cousin has the exact pool as mine except he has converted his to salt water. Since installing it he has an issue when turning pump off it.blows the lid off the skimmer. I 1st thought it.was bc the long hose on the return side so I piped it I'm with pvc and it has no dips in it at all. It didn't have an issue before adding salt generator thing. It's installed directly after the sand filter. Any suggestions. I'll get make and model next time I'm over there