There just doesn't seem to be a definitive answer to this. I have asked many people and read many points of view on bleach & septic. The conventional wisdom answer is that the small amount (1/4 cup) used in a load of laundry a couple of times per week should not present a problem. Everyone here knows that BCG would represent a whole lotta laundry.
I think most septic installers would love to sell you some enzymes or whatever to stimulate the good bacteria growth in the tank, but frankly, you add those enzymes every time you (for lack of a more adult way of saying this) make a number two. However, it seems that flushing the BCG down the toilet is adding a whole bunch of very bad bacteria. I can't even imagine that the municipal sewer systems want this any more than our septic tank does. Adding the bleach might cancel out everything, but then trying to get the levels right might be like sawing a little bit off each leg of a dining room table and hoping that everything levels out nicely.
Let me ask this question for those of you that have been through this: Do you stay in your doctor's office for the duration and have it drained out while you're there? Or do they inject the BCG and send you on your way? One conversation I've had with my doctor's office is that for the first of the two hours, you are lying down, and every fifteen minutes you rotate 90 degrees. (Why do I picture a chicken on a rotisserie?) For the second hour, you can do whatever you want, except pee.
Do you spend the second hour at the doctor's office, or are you supposed to rush right home with your bleach?
Assuming that I stayed the full two hours at the doctor's office and peed it all out there, then for the six hours afterwards, could I just use the same toilet at home and NOT flush until the six hours was up, and then only do the 2 cups of bleach that one time?
