I bought a portable media air cleaner not that long ago plus it had been doing a good task in cleaning the indoor air conditions in our study room. Till recently that is. It seemed to have been doing more worse than nice plus I couldn’t figure out why at first. But then I found out. The air filter in the portable media air cleaner was already used up! And this was a HEPA air filter that came with the portable media air cleaner. Buying upgradement air filters of the HEPA brand for this portable media air cleaner is not cheap. And the fact they get used up so quick is just mind blowing plus not in a nice way. I mean couldn’t HEPA make an air filter that could withstand longer? Their air filters for central heating plus s can, so why not for the portable media air cleaners? It just doesn’t seem to make all that much sense to myself and others to be totally honest. But never the less, the media air cleaner itself is good so I have to spend the money plus buy the new HEPA air filter for our portable media air cleaner. I just hope that maybe I can find some on sale somewhere so I can get maybe a few of them. It would be worth to spend the money now so I do not have to deal with the inconvenience of needing to do this every other month or so. All around it is a good media air cleaner though. It just needs a longer lasting air filter option!