Product review (2 stars): MADE IN CHINA
These blow out a ton of loose carbon during the initial flush and have a notable chemical smell.  I wish the country of origin had been listed in the description so I would have known not to bother buying them.  It took me a couple seconds to put together PROC....People's Republic of China.  I make an extra effort to avoid ingesting anything grown, produced or made in China due to their lack of quality assurance and care to produce quality.  Hoping the particles coming out were actually carbon and not lead particles like darn near everything else that comes out of China.