Dose vital injector 2 also use cotton ball to avoid dirty?

As we know the 1st vital injector use cotton ball to avoid dirty

And the 2nd generation vital injector add a filter to block dose access machine, at the same time avoid dose waste.

So if the vital injector 2 also use cotton ball?

Yes cotton ball also needed to the 2nd generation.

But the places setting on the bottom of machine use to block dust.

Ususally around 7-10 days usage then replace it will be fine.