Certified Pool Operator Practice Test

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Study for the Certified Pool Operator Test. Prepare with comprehensive flashcards and multiple-choice questions. Each question includes hints and detailed explanations. Get ready for your exam!

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What is the Saturation Index for a 330,000-gallon outdoor pool with the following readings: Total alkalinity 50 ppm, pH 7.2, Calcium Hardness 150 ppm, Temperature 76°F, Total Dissolved Solids 500 ppm?

-0.3
-0.8
-0.5
-1.0

The correct answer is: -0.8

The Saturation Index is a measure of the potential for scaling or corrosion in a body of water, with values ranging from -3 to +3. In this case, the total alkalinity is low at 50 ppm, indicating potential for corrosion. The pH is also on the lower end at 7.2, further increasing the likelihood of corrosion. Additionally, the total dissolved solids are relatively low at 500 ppm, which could also contribute to potential corrosion. Overall, these factors make the Saturation Index slightly negative, indicating a low potential for scaling. The other options do not accurately reflect the given data and are therefore incorrect. Option A is too low, while options C and D are too high. Only option B is in the correct range and accurately reflects the data provided.