That is NOT what you said. So, you admit it is possible, good.
Aren't you really just trying to frighten people into buying your products???? Trying to "HELP" them???
I don't know what you mean it isn't what I said but... I said: Yes shocking a well, especially a rock bore well, is no guarantee that you can get rid of a bacteria contamination and many times shocking doesn't help at all.
That "a well" includes all wells.
What I've said is factual, if it frightens you, I'm sorry but trust me, I won't be selling you anything.
Anyway, you seem to not know much about this subject or you wouldn't be retesting for Coliform simply because you don't believe it's possible for your wells to have the problem so there must be a mistae in the previous testing.
You sound like WI DNR used to when they said for yrs that due to their well construction and pump contractor regs they didn't have a Coliform problem. They found out over the last couple yrs that they do. As to your retesting, Coliform comes and goes and can do that in a matter of hours to a day. So when you retest and find none, that doesn't mean the well wasn't contaminated previously.
I've worked under PA DEP, the Federal VA and FHA for about 5-6 yrs and tested every well I tested water from for Coliform bacteria for 19 years. I've worked on Small Water Systems and did the quarterly microbiological testing on them for a number of years.
The drillers here refuse to discuss what they don't know by saying they know everything and go on about sealing a well, double casing on'n on. The fact is that there would not be septic tank and leach bed minimum distance and other type regs IF water wells were not capable of microbiological contamination.
The earth is not a filter unless you mean stones and rock can't sink through it. Everything else that is in liquid form or is dissolved by water gets into the groundwater somewhere at sometime. Otherwise explain how water can go through your earth filter and not contain other things in addition to H2O; like bacteria, road salt, lead from leaded gas, herbicides and pesticides etc, etc..
The common thought of drillers here seems to be that a well with a grouted casing into bed rock somehow seals off the water above the bedrock which is false UNLESS the rock is solid. And most is not solid and if it was, there would not be any recovery of the well UNLESS you think the water in the bedrock is under some type of pressure so it flows UP into the usually 4" 5" or 6" diameter bottom of a rock bore well at the end of the "properly sealed" casing.
Problem is that there can't be any upflow IF the rock is solid. And if it isn't solid, the well can't be sealed off from the water table water above the fractured bed rock.
And if anyone disagrees, explain why and how the water level in a fully recovered well equals the level of the water table water outside the casing.