SectionHiker.com Backpacking Gear Reviews and FAQs Most of the water filters carried by backpackers and long distance hikers cannot remove organisms smaller than 3 microns in size. While protozoa such as Giardia (shown below) and Cryptosporidium are about 5 microns in size, water filters miss bacteria such as …
Read More »The Limitations of Water Filters and Water Purification
