I bought this water purifier for my expedition that I went on with college, in the Lake District. We set up camp next to a steady flowing stream. I collected water in the morning for breakfast. This purifier worked spectacular, the water tasted cleaner than tap water and more over it was fresh and cold. It is easy to use, although I do find it difficult to remove the cartridge at first due to it being stiff. The instructions that it comes with are fantastic, easy to read and in many languages. It also gives you tips on how to make your purifier last so you can use it again.