You're guessing on the amount of chlorine, or that you even need it at
all. If that is surface water in the well, how did it get there? Was
the well head submerged in flood water? Did it come from somewhere
else? Is it still coming from somewhere else? Have you had the water
tested to confirm the presense of bacteria? If you're dealing with a
contaminated aquifer, a bottle of clorox isn't going to help much.

-rev