The PRO filter has been picking up by cyclists and runners from cities with serious air pollution. Here is a new endorsement by Jorge Alvarado from Bogota, Colombia. Frankly, I was rather shocked to see the photos of the used PRO filters. Here is Jorge’s message he has kindly allowed to be published:
6 weeks ago I started using PRO filter. I noted more air flowed through the mask because I felt the the air colder.
Please find attached some photos after changing the PRO filter with new ones.
Also I changed fabric straps with rubber straps, I felt fabric straps too loose.
It is incredible how the PRO filters got dark on outside but inside they are clean, that is a proof they are making their job.
I did not find any disadvantage on PRO filter.
more about PRO filter: