Disney theme parks use bromine instead of chlorine to sanitize the water in their massive attractions—like Pirates of the Caribbean, It’s a Small World, and Splash Mountain (Tiana’s Bayou Adventure)—primarily for the comfort of the guests and the preservation of the ride machinery. Bromine is more stable than chlorine in the presence of organic contaminants and is less affected by the pH levels of the water. Crucially, bromine does not produce the strong, harsh chemical "bleach" smell associated with public pools; instead, it has a distinct, milder "sweet" scent that has become iconic to Disney fans. From a comfort perspective, bromine is much gentler on the eyes and skin, which is vital for guests who might get splashed throughout a long day in the Florida or California heat. Additionally, bromine is less corrosive to the metal pumps and fiberglass hulls of the ride vehicles compared to chlorine, helping Disney reduce long-term maintenance costs for their complex water-based systems. While it is more expensive than chlorine, the combination of superior bather comfort and reduced mechanical wear makes it the gold standard for high-traffic, "show-quality" water attractions at Disney resorts globally.