Sweet PDZ granular formula is an effective way to control odor and moisture buildup in horse stalls. It works through its natural chemistry to eliminate the odor rather than relying on perfumes to mask the odors. Sweet PDZ absorbs the ammonia gas molecules into the granules while releasing sodium or potassium ions into urine, causing it to quickly dry. In addition to horse stalls, it also works in litter boxes, bird cages, dog runs, and other smaller pet habitats. The granule version of Sweet PDZ tends to be less dusty than the powder, and might be more effective on stall mats. | MannaPro Sweet PDZ Horse Stall Refresher Granules | Size 40 lbs