When you have an Arctic Spa hot tub, swim spa, or All Weather Pool, when should you use Arctic Pure Boost (granular chlorine)? There are really only two times you should use Boost as we want the Spa Boy or Onzen Saltwater System to be taking care of the water and not the Boost. Check out this video to learn more. For Arctic Pure Boost or anything else for your Arctic Spa, check out our online store at ArcticSpaStore.com where we have everything for your Arctic Spa with the convenience of free home delivery!