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Sand in the radiator is bad news, not sure how it would get in there unless the system was open for a long time. I suggest you pull the radiator hoses and flush the whole system out with a garden hose until the water comes out in a clean, steady stream. Might be a good time to replace some hoses, too.
If you're replacing other parts/hoses around the thermostat housing (to fix your leak) you could run the hose through there too. I'd verify the leak is fixed and all hoses are on securely before draining to refill with a proper mix of antifreeze.
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