The filter cartridge NFP Premium by Carbonit (activated carbon block filter) meets the highest filter performance at a very good price. We have summarized the filter performance in numbers here. In addition to numbers and descriptive information you will find the tests and original reports for download.
The authors of the blog ClimbLoveTravel have subjected the Grayl water filter to a practical test. Here is the detailed review (in german).
The Lifesaver Liberty Outdoor water filters meet the highest standards with a very good price-performance ratio. We have summarized the official tests and the certificate of ICON in this article. Here you will also find the certificate for download.