Adjust the Calcium Hardness from 75 ppm to 150 ppm in a 150,000 gallon pool. Use Calcium Chloride 77%. ⋅ Use the "Chemical Adjustment Worksheet" in the Handout Packet. Please write the number of this question next to the worksheet that you use. You will need to refer to the "Water Chemistry Adjustment Guide" on page 262 of your Pool & Spa OperatorTM Handbook, 2017 Edition.
