We have been asked many times: Is there a difference between a Portable Water Filter and a Portable Water Purifier? Basically, the answer is No. A filter and a purifier in the strictest sense of the word is about the same thing. A filter removes contaminants and a purifier makes the water cleaner. A portable water purifier and bottle purifier are going to remove the chlorine mercury and lead from the water making it not only safer for you but also much more healthy.