timmmay:
MikeAqua:
If you want to get rid of bugs i.e especially viruses microbes you need more than basic filtering. Chemical sterilisation or boiling are the best options.
Hence the lifestraw type device, which claims to filter out almost everything bad. I'd then treat with water treatment tablets to be doubly sure, but I'd rather remove them rather than just kill them before I drink them.
So about the only method that does it properly is uv treatment