Calcium Hardness Test Kit made by Blue Devil B7320

Directions:

1. Rinse vial marked Hardness?Alkalinity and fill to line A with water to be tested.
2. Add 2 drops of Hardness Solution A and swirl to mix. A violet color will develop if Hardness is present
3. Add Hardness solution B in drops until color changes to a permanent blue.
4. Calculation: Multiply the number of drops by 50 to determine the Hardness in parts per million (expressed as calcium carbonate).
   Example: 7 drops X 50 = 350 ppm Hardness.

• Ideal Hardness is 200-400 ppm. If your water tests over or under this range, consult a pool store specialist for advice.

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