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Hach Co Aquachek Pool & Spa Testing Chorine 4-in-1 AquaChek Yellow tests for Free Chlorine, Cyanuric Acid (Stabilizer), pH, and Total Alkalinity. pH: 6.2-8.4 Free Chlorine: 0-10 ppm Total Alkalinity: 0-240 ppm Stabilizer (Cyanuric Acid): 0-300 ppm
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🇺🇸 Ship from USA · On Agora since 2025
$12.99