Which water filters remove viruses?
Because viruses can be as small as 0.004 µm (microns), choosing water that has been filtered through an NF (nanofiltration ~0.001 µm) or RO (reverse osmosis ~0.0001 µm) membrane is the only way to be sure they’ve been effectively removed.
More information and image credit: https://h2ocoolers.com/news/water-safety/how-to-ensure-your-water-is-safe-from-viruses-like-the-coronavirus/