Your dead right rastagirl, It's not a case of ratting him out, it's a case of warning others to stay safe. Just like the only way we can get rid of soap bar is to boycott it completely, when people start trying to sell you shit that can kill you it's time to boycott them and no point in only one doing it you have to inform people

As for the product you have you can still make good quality butter from it, the sand will settle at the bottom and you can really see what could have been going into your lungs at the end of the process. It was scary when i made butter for a mate who got stung with an ounce of grit Id say a good 3grams was grit that could have been in someones lungs its scary. So fair play to you for outing one that puts profit before the people.