Freshwater Hot Springs Spa Ace Cell Salt Water Cleaner - 77139 Freshwater Hot Springs Spa Ace Cell Salt Water Cleaner is a simple way to clean your Hot Spring Ace Cell. Part number: 77139 The Hot Springs Spa Ace Salt Water Sanitizing system requires very little salt to treat a hot tub or spa and does not require that additional salt be added to the spa unless the spa is drained. No matter the model of your spa or hot tub, or when it was made - it's important that you regularly sanitize your spa to prevent bacteria build-up. Choose from our selection of hot tub filters and maintenance products to find the right hot tub sanitizing system for your spa - at the right price! Hot Spring Spa Supplies carries spa fragrances, air & water valves, control systems, filter accessories, lights, cleaners, pumps, thermostats, and more for virtually every hot spring model.