AT154CEH canister filter


First time posting here and wondering if you can help me out with a query.

We have a AT357CEH extractor and very nice it is too. Despite using the paddle a lot to clean the manometer reading is still a bit low.

I presume the canister filter is clogged so how do we clean it bearing in mind we solely mill foam so the filter is clogged with fine PU foam and we cant blow this out around the workshop. Is it a case of replacing the filter, if so what the model and is it a generic type of filter we can source from a number of places?

Any thoughts most welcome. :smiley: