Scum will come off with solvents. Solids like lint, paint, bits of thread strippings, etc. that are mechanically trapped at a restriction will dislodge if the flow is reversed.
A closed system doesn't need continuous filtering. A closed system doesn't need continuous filtering. I think a good solution would be having a fairly restrictive filter but in parallel and normally isolated, say off the legs of "T"s followed by shutoffs. Every week or month one could open the valves and kink the tube between the "T"s so flow is forced through the filter. Between cleaning cycles the filter could be detached and washed.
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