The Pure allows you to use water from ponds, lakes or streams where the water quality is poor or questionable. The ADM Pure includes a filter that removes 99.999% of bacteria and viruses. The Pure filter’s UltraCeram electropositive technology attracts and retains viruses, cysts and bacteria and has been certified by third-party testing. Clear AutoDogMug included. Filter is made in the USA, bottle made responsibly in China. BPA Free.