Flushed water pump, now have black sand when running outside faucet?


Flushed out water pump used with our well because we had lower water pressure. After had good water pressure in the house. The outside faucet was used to fill poor up 3". Found black sediment, looks like black sand. We did not have an issue with black sand before we flushed out the water pump. What can be done to correct the problem?

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