Rice hulls are a filtering aid that help improve the speed of lautering, and they also help to avoid a stuck mash. They are particularly effective when brewing high gravity beers with a large grain bill and beers made with a high percentage of speciality malts. Rice hulls are also helpful with wheat and rye beers, since those grains do not have husks. Rice hull usage should not exceed 10% of the grain bill.
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I bought rice husk from Austin Homebrew for gardening and so far the product served my purposes in keeping soil loose and meanwhile retaining moisture in the containers. I think the product deserves a thumb-up and I definitely will go back for more once mine runs out.