Get four critical readings in seconds. AquaChek® Yellow strips quickly test Free Chlorine, pH, Total Alkalinity, and Cyanuric Acid (Stabilizer)—perfect for pools and spas that use chlorine as the sanitizer. The included Cyanuric Acid check is especially important outdoors, where UV rays can break down chlorine.

Why it’s great

• 4 results, 1 dip: Free Chlorine, pH, Total Alkalinity, Cyanuric Acid

• Fast: Dip for 1 second, remove, and read in seconds

• Chlorine-focused: Ideal for chlorine-treated pools and spas

• Helps prevent problems: Proper CYA helps protect chlorine from UV loss