Product review (2 stars): No charcoal purge - is this really working?
I wish I had seen the September reviews before buying - I think this may be a fake filter.  I don't know. These filters are not certified in any way and during the before-use filter purge there was no indication of charcoal in the discharge as with other water filters I have installed and the fit is not completely right.  Either it's working great and I'm completely wrong - or this is an imposter filter duping us all.