Toward the end of last season and this season, I've been getting de back into the pool. I have a Jandy dev48 which is 14 years old and has been trouble free. Instead of breaking it down, I just replaced the internals with one of those complete setups that includes the manifold, and filters all attached. I'm still getting blow back? At this point I'm thinking it's the Jandy multiport which is 14 years old as well. I changed the gasket 8 years ago because it was leaking from the waste port but has anyone ever experienced this issue with the DE due to the valve? I figured I would see leaking again if the gasket was bad? I'm thinking of just installing a new valve this time given the age of it. Any thoughts? Thanks