B7320 Blue Devil Test Kit Calcium Hardness

Calcium Hardness Test Kit made by Blue Devil B7320

Directions:Rinse vial marked Hardness?Alkalinity and fill to line A with water to be tested.Add 2 drops of Hardness Solution A and swirl to mix. A violet color will develop if Hardness is presentAdd Hardness solution B in drops until color changes to a permanent blue.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.