I wonder what brands they manufacture for??

I bet the band-aid company next door loves them. And the clean room where the filter media is processed is world class. The pre-installed rust is just a special feature that they pass on to the customer free of charge. But what do you expect for a $2.00 filter?

rusty filter.webp
rusty 2.webp
 
There was no crimp or glue on the media seam, looked to just be overlapped a pleat or two when it went together, lol.
 
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