Interested in learning more about Caldera’s Freshwater Salt System? Learn what it takes to set up and maintain the system with minimal effort, and easy routine maintenance. Caldera Spas’ Freshwater Salt System is regarded as the pinnacle of water care systems. The system generates a small amount of chlorine from low levels of salt in your hot tub. This means that your water stays crystal clear without the chemical smell, irritated skin, or any side effects!