Need advice on Nautilus 48 DE filter grid replacement.

I have a Nautilus DE 48 (see label). I think it is fairly old. I am seeing lots of DE and dirt in the pool after backflushing and adding DE.

My Polaris filters are clogging with tree droppings in five or six hours.

I think that I need to replace the grids in my filter. Do I really need to take it apart and check before I order parts? Should I just replace the gasket in any case?

Any and all advice appreciated.

Thanks!

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