Hot Spring Chlorine Granular 1.75 Part Number: 72435 1.75lbs of Chlorine Concentrate Granules Whether you're a new spa owner - or simply just taking on your own spa maintenance, our Freshwater Hot Spring Spas Chlorine Concentrate is an essential hot tub treatment to have as part of your spa care routine. No matter the model of your spa or hot tub, or when it was made - it's important that you regularly sanitize and treat 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.