Air con cabin pilter main purpose is to block smaller object/fine dust being blown directly to cooling coil. Originally GaGa designed to use 1 paper filter + 1 recycable pollen filter. Objective to have 2 paper filter instead of 1 is to filter vapor & trap excessive dust being penetrated through the 1st layer of paper filter.
Many understand they need to wash the pollen filter, but totally omitted pollen filter lobang is much course than paper filter. Some claim their car got dead rate smell even after change cabin filter is bcoz they didn't change the paper filter. When any wap air trapped on the paper filter(human slime) that will cause bau mayat when aircon start up. Also, normal aircon cooling coil bocor is bcoz it was rusted by interior vapor from human breathe/saliva spit by wife when they shout don't drive fast. Paper filter is there to stop this from rusting your cooling coil.
Time I purchased my BLM was 14k mileage, pollen filter was cleaned, but suffer from dead fish smell. I purchased cabin filter for RM28+shipping, solved the problem. After a month, I replaced pollen filter with 2nd unit paper filter. Now after 10k mileaged standing at 24k, I planned to change them again and to introduce this gooding to fellow GaGa members. Small price to pay, better cabin air quality. Less dust, less sick. According to some other review, normally cabin filter can last atleast 9 month, I'm just being lansily take care of my young family, that's why I change it often.
Minimum order 3 nia. I ady took 2

more the marrier la ofcoz. Very fast can arrange TT liao I guess