Meaning of reusable pollen filter - dreamstation

[BHappy]

I recently ordered a "Reusable Pollen filter" for my philips dreamstation cpap machine. It looks like so : 
https://imgur.com/a/nAK7yKt


My question is, which part of this filter is reusable ? I would think the actual filter is, but I can't find instructions on what the replacement filter specs should be (what filter (film?) do I need to buy) and how I can go about actually reusing this filter ? Or does reusable in this case mean I can pop the filter out and wash it ? If so, I can't find instructions on how i can pop the filter out. I have only one, so can't risk just pushing it around. I have washed it with water and gentle strokes of a soft brush but it didn't look like it'd pop out.

[Sleeprider]

They are not very expensive and are made to be washed until damaged. I would just run cold water through from the back-side. These filters are not rated for efficiency, so it's probably as good as any dust filter. The plastic carrier is integrated and it's not meant to be disassembled.