FILTERS OMNIPURE USA

Omnipure filters are of good quality.

The coal used is selected and acid washing. On first use and on the duration of its use, it does not leave traces of charcoal powder. Omnipure filters have a constant grain and guaranteed, besides the fact that they have a certain length of time, it prevents water to make preferential pathways.

NSF certification

http://info.nsf.org/Certified/DWTU/