To keep your mill working great please store it in a dry place (never above your stove where steam can re-hydrate the ingredients). Our large mills have a ceramic grinding mechanism which can grind anything from Molly’s seasoning blends to just plain salt or pepper. To adjust the coarseness, just turn the white dial located on the top of the mill, but be careful to not over tighten. Your mill can be washed with warm soapy water, just make sure it is really dry before refilling. Feel free to contact us at firstname.lastname@example.org if you have any additional questions. We have a no hassle guarantee on our ceramic grinder mills. If you ever have any problems just return it and we will be happy to send you a replacement.