Bought new less than a year ago from Amazon. I just switched to a new filter. It's clean and ready to go. I will also give you additional replacement filter that I still have from buying pack of replacement filters.

This has been really helpful in construction season. Pick up from EV.

Amazon price = $84.99+tax
Sell here for $55

More info about product here:
https://www.amazon.com/GermGuardian-AC4825-Sanitizer-Allergens-Guardian/dp/B004VGIGVY/ref=sr_1_3?ie=UTF8&qid=1527985462&sr=8-3&keywords=hepa+filter+air+purifier