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English Instructor Manual (PDF) - Metric Version - National ...

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Chapter 10 – Water Circulation<br />

Handbook: Pages 117 - 136<br />

Suggested Time:<br />

45 minutes<br />

PowerPoint Slides: Chapter 10<br />

Materials:<br />

Calculation Formulas handout (Appendix J from <strong>Instructor</strong> <strong>Manual</strong>)<br />

Calculators<br />

Samples of circulation and fi ltration system components<br />

Samples of fi lter media<br />

Coffee cup, saucer, and spoon<br />

Pump Room Tour video demo (from the <strong>Instructor</strong> DVD)<br />

Objectives: At the end of this lesson, the student will be able to:<br />

1. List the components of a circulation system.<br />

2. Explain the relationship between turnover rate and fl ow rate.<br />

3. List the 5 types of suction entrapment.<br />

4. Explain how to prevent or minimize the potential causes of suction entrapment.<br />

5. Explain how water is regulated within the circulation system.<br />

Video Demo: Show the Pump Room Tour video demo from the <strong>Instructor</strong> DVD.<br />

Leading Questions:<br />

What is the main function of a circulation system?<br />

How does the circulation system accomplish its main purpose?<br />

Activity: Have the participants imagine the human body as a swimming pool. Ask them to name<br />

the important parts of the body. Answers should include the heart, lungs, kidneys, digestive<br />

system, blood vessels, and brain. Have the participants equate the various parts of the human<br />

body with the parts of a pool. These should include:<br />

Heart = pump<br />

Kidneys = fi lters<br />

Lungs and digestive system = chemical feeders<br />

Blood vessels = pipes and valves<br />

Brain = system automation<br />

Remind participants that the body is also capable of heating, cooling, and discharging waste, just<br />

like a pool.<br />

Key Points: Explain that before you can understand water circulation, you must understand the<br />

terminology used to describe functions of circulation. These include:<br />

Turnover rate is the time it takes for the circulation system to move the number of<br />

gallons equal to the volume of water in the pool through the fi ltration equipment. It<br />

is measured in hours. Most standards recognize the following turnover rates as the<br />

maximum time it should take for one turnover:<br />

© 2014 <strong>National</strong> Swimming Pool Foundation® Page 71

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