FIRST, you should have those ...

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FIRST, you should have those particles analyzed.  It MAY be something as simple as "hard" (mineral-rich) water, suitable for drinking but not so good for use with soaps for cleaning or other chemical applications.  IF it is something that should have been removed by the supplier in processing, they need to be held accountable.  If it is a normal and safe condition like mineral content, for you own uses you may need to install a "water softener" that will remove the excess mineral content.