The other day I mentioned Wisconsin having problems with their well water quality. I received an e-list email today with a link to the article below that shows some of the problems. It mentions viruses but I believe the author simply interchanges virus for bacteria. This is only for municipal wells but they are having the same problems in residential wells.
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CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.