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 6 – Water Balance<br />
Handbook: Pages 59-68<br />
Suggested Time:<br />
PowerPoint Slides:<br />
Materials:<br />
45 minutes<br />
Chapter 6 Slides<br />
Calculators<br />
Water Quality Guidelines handout (Appendix K from <strong>Instructor</strong> <strong>Manual</strong>)<br />
Langelier Saturation Index handout (Appendix L from <strong>Instructor</strong> <strong>Manual</strong>)<br />
Saturation Index Worksheets (Appendix M from <strong>Instructor</strong> <strong>Manual</strong>)<br />
Several chemical containers<br />
Objectives: At the end of this lesson, the student will be able to:<br />
1. List three reasons why pool water balance is important<br />
2. List the components of pool water balance<br />
3. Calculate pool water balance for a pool<br />
4. Demonstrate how to adjust improperly balanced pool water<br />
Leading Questions:<br />
What does the term water balance mean to you as a pool operator?<br />
Can anyone give an example of corrosion?<br />
Can anyone give an example of scale formation?<br />
What is the expected life of a fi lter or pump before it needs to be replaced and do you<br />
think that corrosive or scale-forming water will affect that?<br />
If your pool water is corrosive or scale-forming, what can happen to the pool shell and<br />
equipment?<br />
How long should a pool fi nish (paint, tile, plaster) last before needing to be re-surfaced<br />
and do you think that corrosive or scale-forming water will affect that?<br />
Key Points: Discuss the defi nition of water balance, which is the correct ratio of mineral content<br />
and pH that prevents water from becoming corrosive or scale-forming.<br />
Explain that maintaining overall water chemistry is a two-part process. What is good for the<br />
swimmers is to maintain proper disinfectant and pH levels. What is good for the pool is to<br />
maintain good water balance to protect the pool shell and equipment. The two processes are not<br />
necessarily the same.<br />
For example, the pool water may be perfectly balanced but not swimmable, and the same is<br />
true the other way. The pool water may be swimmable but not balanced. Explain that as pool<br />
operators, you must merge the two processes and make the pool water both balanced and<br />
swimmable.<br />
© 2014 <strong>National</strong> Swimming Pool Foundation® Page 57
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