Certified Pool Operator Practice Test

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What should be done if pool water hardness exceeds 800-1000 ppm to control scaling?

Reduce the temperature

If the pool water hardness exceeds 800-1000 ppm, reducing the temperature is the best course of action. This is because higher temperatures can cause the minerals in the water to become more concentrated, leading to scaling. Adding more chemicals or lowering the pH level may provide temporary relief, but it will not address the underlying issue of high water hardness. Diluting or replacing the water with water of lower hardness is not a feasible solution as it requires a large amount of water and is not practical for regular pool maintenance. Therefore, reducing the temperature is the most effective and efficient way to control scaling in a pool with high water hardness.

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Add more chemicals

Lower the pH level

Dilute or replace with water of lower hardness

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