The Freshwater Hot Spring Spas Salt Water Test Strips for Spas & Hot Tubs provide an efficient and comprehensive means of testing the water in your spa. While similar to pool water management, Spas' higher temperatures and smaller water volume present unique challenges, including faster chemical reactions and increased evaporation rates. Maintaining ideal levels of active and total cleaner (Bromine or Chlorine), pH, Total Alkalinity, and Hardness will help ensure that your water is clean and healthy, while protecting your Spa against damage from fluctuations in pH, and build-up of scale formation. To keep your SPA water clean and healthy is important to test the water before and after each use, and to treat it regularly. We recommend tracking your results each time you test.