When you mix bleach into the water if you get it JUST to the point where you
can smell it in the water, it is already sterile enough to kill off bacteria
and viruses and other bugs. If you use any more than that you're not doing
anything but making the water less drinkable.
Iodine is also a well-proven water sterilizer.
It is worth buying a swimming pool 2 bottle test kit if you think you
will be purifying water. You want your drinking water right in the
same range as a pool. Washington DC city water tested "ideal" with a
test kit when I lived there.
It works out to 2-3 drops of bleach in a gallon of water, depending on
how fresh the bleach is. Wait about 10 minutes before you test or
drink the water
Right here and now I want to correct something. Putting any chemical into
water is NOT purifying it, but sterilizing it or disinfecting it. You
actually don't want pure water because it's too easy to grow stuff in it.
But you do want sterile water.
Actually, 2 drops per QUART of water (4 times the amount you recommend):
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