Product review (5 stars): Very pleased with these filters and they are sending the updated BestAir Perfect Blue HW14 Filters (not in shown picture)
Just received this order and these are the updated filters from Best Air with a chlorine filter layer as well in addition to a pre-filter like the original ones from BestAir and the original OEM ones (they no longer have a pre-filter) - these are called BestAir perfect blue now.  The updated one seems to perform a bit better than the original best air in keeping the filter running longer.  Overall I've been happy with the original best air HW14 replacement filters, and the new updated ones even more.  You can't really beat the price and the comparable performance compared to the OEM ones especially since they removed the blue prefilter on the OEM filters.  I haven't gone back since and am happy with these.  I do recommend using anti-microbial in the tanks regardless of the filters used - I use the protec for ease of use and also do flip the filter between fillings which helps prolong the filter.