How does the hollow fiber remove bacteria?

The hollow-fiber wall has countless small pores that physically block bacteria and particulate contaminants larger than the membrane's rated pore size (e.g. 0.2 μm on the household cartridges). It does not remove dissolved substances such as salts, dissolved metals or dissolved chemicals, so the output is not "pure water". Third-party test results cover E. coli only, for specific samples and dates (see the Technology page).