FreshWater Spa Salt for ACE - 5 lbs 5lb Container of Freshwater Spa Salt for the ACE Spa System for Sanitizing your Hot Tub or Spa. The Ace Salt Sanitizing System requires feedback/input and is not a 'set it and forget it' care system. 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.