CleanAir Filter Set (HEPA + Carbon Filter)

Seems like the filter needs to be changed every 6 months.

I appreciate that the items were shipped immediately and received in good condition. I also like that the packaging is very earth-friendly (eco-bag is the way to go). However, I noticed that after changing the filters, the red light indicator in the air purifier itself did not change to green. I cleaned the unit prior to changing the filters as was recommended, so I don't know why the unit cannot detect the new filters. Please let me know how to remedy this. Otherwise I think the filter set works as advertised.