Product review (4 stars): Seems to be doing something
Seems OK after your make sure your cycle water through it for at least 5 min to rinse out all the charcoal dust.

I guess it works. Water tastes good.  I have no idea if it is removing anything bad.

Being cheap and from China, I'm a little concerned of heavy metal contamination.  Afterall, they can't even make dog food right.