I don't know if 12 gallons is too much. It may be based on experience, and if you are far from the bleach store, you could have extra at hand in case I do need more. I definately do expect 2 gallons is not enough. You can use calculations, as a better starting point, but you should also consider pH. The calculations would involve alkalinity to better compute the needed amounts I think. I think there is a better way. that you may think is nuts. It can take a long time for the chlorine to get to the bottom if you don't have casing to the bottom. Pellets can get chlorine down there. But there is more. The first line of https://terrylove.com/forums/index.php?threads/well-sanitizing-extra-attention-to-4-inch-casing.65845/ has a link to a nice sanitizing article, but then I go into my possibly-overkill extension. That is mostly aimed at a bottom feeding well. My well has casing all of the way down. You may find some info there that you may adapt to your well.my well driller suggested 2 gallons of bleach in my well, one guy said he wants to use 12 gallons, whoa.. is that nuts or is that about right??
8" well, static water at 200ish 600' deep.
http://aesl.ces.uga.edu/publications/watercirc/ShockChlorination.pdf brings up some extra consideration if you have arsenic. I don't have much arsenic, so I don't take that into account. That publication suggests
3.915 gallons of bleach for (600-200)=4oo ft of 8 inch if I did that right. But are they using the bleach concentration I would want? I think bleach gets consumed by what it meets in the well, so measuring the chlorine level with high-range test strips lets you compensate for that.
Your well has about 27x as much sanding water as mine. (cross section 4x and water column 6.66x). I think I used 1 gallon of 8% bleach. I think I used 2 gallons of vinegar too.I went lower pH than the minimums, and you can't go super low on pH with vinegar. There is a pH range, and I wanted to be lower pH than the max needed.
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