Do I need a diffuser filter in a P30i nasal mask?

Good morning,
I just started using a ResMed 11 and was able to use the mask I tried and took home from the sleep study.
I noticed that the diffuser filter on the medium nose pillow did not have a filter pad inside like the one I could have purchased.
Do I actually need one? It seems to work well without it and then I don't have to worry about getting any black dots on the filter media as others seem to have.
Thanks for any feedback!

The part is optional.
It helps make the operation quieter.
If you don't need it, don't buy it.

I removed mine a few months ago. Seems to be OK.

Thanks for all your answers.
I'm fine without using it- one less part to maintain.