Okay, this is for the obsessed. If your water smells like a gas leak or a dead animal, you might have sulfate-reducing bacteria in the well itself. In that case, a continuous chlorine injection system is your answer.
You inject a small amount of chlorine into the water, let it flow through a “contact tank” for 20+ minutes, then run it through an activated carbon filter to remove the chlorine. It’s overkill for most homes, but it sterilizes the entire system. You’ll kneel before your faucets.
But let’s be real: most people don’t need this. Start with the easy stuff. Shock chlorinate. Check your water heater. Buy a whole-house carbon filter. In that order. You’ll fix the stink in a weekend and save your next barbecue from becoming a running joke.
And hey, if all else fails? Just tell your guests it’s “rustic mineral water.” They’ll think you’re sophisticated. I won’t tell.