I am shocking my drilled well.
It's winter and the cap of the well was buried in snow but I found it and dug it out. The nuts for the well cap bolts were a little rusted (okay, a lot rusted) and took some cranking—and my arthritic thumbs shouted back.
To shock the well, I told it off-colour jokes and swore at it, using almost all the harshest language I could think of and then I poured 133 gallons of chlorine bleach into it. I may be exaggerating but it seemed very much like 133 gallons as the chlorine glugged into the well.