Rice hulls offer a natural, easy way to help prevent a stuck mash! Rice Hulls are used to aid in permiability of the mash when you’re doing all-grain brewing with a high percentage of wheat or oats, or if you have had lautering problems. They do not impart any flavor to the finished beer. Use at a percentage not greater than 5% of the total grain bill. Typical dosage is 1/2 lb in a 5 gallon batch.