I’m noticing a lot of DE in my pool. I pulled apart the filter about a month ago for it's normal cleaning and ran water inside each of the screens, and didn’t see any holes or leaks…

One thing I haven’t replaced in quite a while is the little mesh / sock thing on top of the tubes inside the filter - but I only think I replaced it once.

If not any ideas on where to start troubleshooting where DE is getting out of the filter and into the pool?