I bought some Briess pilsen light DME (my LHBS was out of golden light) to use for making starters. I first just boiled the water/DME in quart jars in the microwave but noticed a lot of silt in the bottom of the jar. Yesterday I decided to mix up some on the stovetop but even after letting it boil for 10 minutes there was still a fair amount of silt/grit settled on the bottom of the pan after I let it cool a bit.
Should I have boiled it longer or would it have eventually dissolved?