Rice Hull Usage for Wine and Beer Makers
Rice hulls are the coating for the seeds, or grains, of the rice plant. To protect the seed during the growing season, the hull is made of hard materials, including opaline silica and lignin. They impart no flavor, color nor aroma when used in beer and wine production.
When using high percentage of wheat, rye, or oats all of which have no husk, brewers typically add rice hulls to aid in filtration thus preventing a stuck mash or sparge. They an also be used as a filtering aid if you’ve experienced lautering problems. Use at a percentage not greater than 10% of the total grain bill.
Rice hulls are commonly added to the grapes as they are pressed. They make the grapes less slippery and therefore less liable to push out through the press staves during pressing also yielding more juice. The addition of rice hulls makes it easier to press any variety of grapes. They also seem to help produce a cleaner juice.