[Drdogface]

I have a small cabin with a well and 3000 gal holding tank. The water has recently developed a strong sulphur smell. I'm sure that a gal or so of bleach in the well would likely kill the bacteria causing the problem there but not sure how much to put in the tank or if there is a better plan of attack. Yes, I will call the water treatment companies here locally but thought I'd consult the brain trust here too

Ideas?