Do pump filters remove viruses?

Most hollow-fiber and ceramic pump filters in this category are rated to remove bacteria and protozoa (like Giardia and Cryptosporidium) but not viruses, which are smaller. If virus protection matters for international travel or heavily contaminated water, look specifically for a model marketed as a purifier rather than a filter, and verify the manufacturer's stated rating. The listings here vary in their claims, and none came with independent verification in our data.