Home Product Grain Based Ethanol High Capacity Pre-Cleaner HIGH CAPACITY PRE-CLEANER Initial Grain Pre-Cleaning. Used to remove impurities from grain before further processing. Coarse Material Separation. Helps separate larger unwanted material from incoming grain. Sand & Foreign Matter Removal. Separates sand and other foreign material during pre-cleaning. Dust & Light Impurity Removal. Addresses dust and lighter impurities within the cleaning process. Multiple Capacity Options. The equipment is available in different capacities and models.