Backyard chickens should have constant access to a dust box. It's a natural, non-polluting cleaner. A dust bath encourages ruffling and preening. Both of these are necessary for healthy chickens. Ruffling dislodges dirt, dander, and feather flakes. Preening releasews new oils that spread under the feathers to keep them in good condition and waterproof. Lumino Dusting Bath Powder is a blend of specially selected earth minerals, clay, washed sand, dust, oyster shell powder, and crushed alfalfa meal. This fine loose mix is easily fluffed under the feathers.