Question: Do the Respro masks come with a filter and valves included or do they need to be
                  purchased individually?

Answer: Respro masks come with 1 filter and two valves included, they are ready for use.
We usually recommend a large mask for most average adult males, and a medium mask for most
average women and teens. The difference in the two masks is only about a half inch. If your unsure
I would go with the large, you could always fasten the Velcro tighter.
Question: Does gotpollution have a retail location or are you mail order only?

Answer: No, currently we are mail order only.
Question: Are the filters and valves interchangeable?

Answer: Yes, the filters and valves are interchangeable between the Techno, City, and Sportsta Masks.
Question: How long do the Respro filters last?

Answer: The filters are rated by the manufacturer for 30 days of normal use.
             Or 720 hours (24hours per day x 30 days)