By all means, if you are getting granite chips coming out your faucet, don't run the pump. It will grind up the innards quicker than the swish of a cats tail.
If this is a submersible pump, new, they have a fine screen on them, so the chips would be ore like dust, jet style pumps have a courser screen. In any event, if you feel like monkeying it, all you might need to do is yank the hose up a few feet to bring the end out of collected silt. This very thing happened to me.
I also went thru "the heartbreak of iron bacteria", and running bacteria thru the water heater will produce a smell you won't forget.
Good luck
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