The air going through dried out some of the rust flakes inside the pipe. Often just certain fittings go rusty, or a poorer bit of pipe section....
You flushed it with water, the flakes reverted the selves and many flowed on through.
Now, as the water sits, the flakes left fall to the bottom of the pipe, and the cycling use of the water line sloshes the flakes to wherever they catch and pack up. A corner or the bottom of a hydrant or such.
Indeed the flakes and a bit of sediment can pack up a line pretty quickly.
But, I'm just guessing?
Can you shut the pump, open a line I guess at the outbuilding, and pump water or air backwards to see if it breaks loose backwards?
In the end you still have all the junk in the line, but maybe it would help get it flushed out, or at least provide an answer as to what is going on.
I wonder if the gunk built up just past the Tee to the outbuilding?
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