How much does filtering viruses matter in a water filter?

Posted by GrovelingPeasant@reddit | preppers | View on Reddit | 4 comments

I'm looking into purchasing one of the Sawyer Squeeze filters, mostly for practical use in camping and hiking but also in the case of a natural disaster of SHTF scenario. I live in South Louisiana, so we have a prevalence of both filthy water and frequent destabilizing natural events.

I'm leaning towards getting the Sawyer Squeeze (http://a.co/e6wDwgx) which seems to use their S1 filters, and thus only filters out bacteria, parasites and such. My question is: is it worth investing the extra money in buying their S3 filter, which is made to also filter out viruses? Are waterborne viruses a frequent problem in domestic water? SHTF scenarios?