Jed 50-Count 7 Factor Pool/Spa Test Strips. It tests for Free Chlorine, Bromine, Total Chlorine, Alkalinity, pH, Total Hardness, and Cyanuric Acid. These strips are ideal for pools and spas. Simply dip the strip into your pool or spa water for one second and remove. The strip will give you instant results, helping you maintain the proper chemical balance for your water.