Here’s the filter after a few hours of use in 200+ AQI. Original color is the white border visible around the edge (where the filter is pinched in place by the holder).
(Back of the filter wasn't discolored at all.)
Here’s the filter after a few hours of use in 200+ AQI. Original color is the white border visible around the edge (where the filter is pinched in place by the holder).
(Back of the filter wasn't discolored at all.)
I just changed the filter in my Flo Mask Pro, which I had changed just before our two days of 200+ AQI. I was out (and masked) for maybe 4-6 hours total.
The filter was visibly *darkened*, which I've never seen before.
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