Review on Flintar BS-03 3-in-1 H13 Grade True HEPA Replacement Filter, 2-Pack – Compatible with PARTU BS-03 HEPA Air Purifier by Tyler Vaughn

Very poor filtration after three months of use. The supposed activated carbon filter requires serious work because it is almost invisible. (Don't confuse the foam rings at the top and bottom of the filters.) I would like a detailed functional verification of this filter from a nationally certified independent laboratory or a report from a government laboratory for the last 12 months. . In the meantime I bought carbon filter sheets and cut my own to fill the missing ones.