English Instructor Manual (PDF) - Metric Version - National ...
English Instructor Manual (PDF) - Metric Version - National ...
English Instructor Manual (PDF) - Metric Version - National ...
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Chapter 7 – Pool & Spa Water Problems<br />
Handbook: Pages 69-84<br />
Suggested Time:<br />
PowerPoint Slides:<br />
Materials:<br />
60 minutes<br />
Chapter 7 Slides<br />
Calculators<br />
Calculation Formulas handout (Appendix J from <strong>Instructor</strong> <strong>Manual</strong>)<br />
Chemical Adjustment Worksheet (Appendix N from <strong>Instructor</strong> <strong>Manual</strong>)<br />
Water Chemistry Adjustment Guide handout (Appendix O from<br />
<strong>Instructor</strong> <strong>Manual</strong>)<br />
Several chemical containers<br />
Pool Math Workbook<br />
Objectives: At the end of this lesson, the student will be able to:<br />
1. List the environmental factors that contribute to pool water quality problems<br />
2. Calculate amount of chemical for product label chemical dosage situations<br />
3. Calculate amount of chemical for product label chemical adjustments<br />
4. Calculate amount of chemical when no product label adjustment information is<br />
provided<br />
5. Perform chemical adjustments for breakpoint chlorination<br />
Leading Questions:<br />
How many different chemicals have you had to use at your facility?<br />
How do you know how much of any given chemical to add at any given time?<br />
Key Points: Explain the factors that make swimming pools part of an open system. Be sure to<br />
include the following:<br />
Effect of air, wind, pollution, sunshine, lawn fertilizers, weed killers and users<br />
Key Points: Discuss the three kinds of chemical adjustments that can be performed. Include the<br />
following:<br />
Product label chemical dosage<br />
mg/L adjustment from information obtained from the product label<br />
mg/L adjustment when information is not available from the product label<br />
Activity: Work the students through an adjustment for each of the three types of chemical<br />
adjustments they might be required to perform. Be sure to use the worksheet shown below.<br />
Provide students with blank copies of the Chemical Adjustment Worksheet to use for this lesson<br />
and to have for the fi nal exam.<br />
Product label chemical dosage example. You have a 375,000 litre hotel pool. You are having<br />
recurring problems with algae blooms and decide to use an algaecide. The label reads: For an<br />
initial application or when pool water is changed, use 1 litre per 95,000 litres of water. How much<br />
do you add?<br />
© 2014 <strong>National</strong> Swimming Pool Foundation® Page 61
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