Test your Free Available Chlorine/Bromine
Rinse and fill chlorine/bromine (Cl/Br) cell to mark with water to be tested.
Add 5 drops OTO. Cap and invert to mix.
Match color in cell with a sanitizer color standard. Record as parts per million (ppm) total chlorine or total bromine.
See dosage chart on side of your preferred hth® sanitizer. To raise bromine level, follow directions on hth® Spa™ Brominating Tablets.
Test your pH
Test your Total Alkalinity
Test your Total Hardness
Test your Cyanuric Acid