The OKO (Nano) water filter has three filtration levels, they use the same Nano Filtration Technology that was co-developed by NASA for use on the International Space Station.  You can be confident in knowing that serious contaminants are being removed from your water wherever you are.

Whether camping, traveling, hiking, biking or in case of an emergency, OKO filtered water bottles will allow you to drink fresh, clean water from most water sources worldwide.