HEPA filter question

[NIK26]

Got a Levoit air purifier that uses 2 Filtrete Size A HEPA filters. Been using it for months and the outer side of the filter looks dirty already, but the inner side is still clean and white af. Should I replace both of them now or wait til the inner side is all dirty too?

 

[PicklePwr]

Got a Levoit air purifier that uses 2 Filtrete Size A HEPA filters. Been using it for months and the outer side of the filter looks dirty already, but the inner side is still clean and white af. Should I replace both of them now or wait til the inner side is all dirty too?

You should replace both now. A dirty outer filter means reduced airflow for your purifier, making it work harder and less effectively overall. It's essentially choked, and letting it get too dirty can stress the motor. While you could wait, you're just compromising your air quality and the purifier's efficiency in the meantime.