The only component in a system which could be the source crap is the compressor. Some compressors are crappier than others, so one might expect more crap to be generated by a crappy compressor.
Filters are designed to catch a lot of crap. As shown in the pictures, when they've done their job they stop working because they're full of crap...so you must install a new filter to catch the remaining crap being generated by the compressor.
The compressor will eventually stop working too...when it no longer can produce crap because it's crapped out.