Our well goes down real deep, too, OP. But it comes out of the ground to where you can open the top if you need to (that how they put the pump, etc. in there). When we were selling my parents house, the health official actually walked me thru how to pour Clorox down the well. It does filter through because I remember having to run the water till I could smell the Clorox coming from the faucet.

As for the water softeners, my sister had a system installed. Very expensive and they can't drink their water at all. The taste is terrible. But it did soften up the water.

OP, all I know about our bottled water is, I feel like it's better than drinking our well water. I will look on our bottled water and see if I can find those initials you're talking about.

We have a great well, though, with TONS of pressure. When our well was dug years and years ago, it was so much water, it couldn't be measured.... over 20 gallons a minute. So we love our well water --- we just don't like the taste of it!!!