Black specks after flushing water pump, why?

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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 pool up to 3". Found black specks, looks like black sand in the pool. We did not have an issue with black specks/sand before we flushed out the water pump. What can be done to correct the problem?



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