Dive Into Success: 2025 Certified Pool Operator Practice Test – Make a Splash!

Question: 1 / 400

At what hardness level does pool water typically begin to require dilution or replacement?

400-600 ppm

Pool water generally requires dilution or replacement when the calcium hardness level reaches 400-600 ppm. This is because high levels of calcium can lead to cloudy water, scaling on pool surfaces, and decreased effectiveness of chlorine. Option B, ranging from 600-800 ppm, is incorrect as it is a higher range than the desired level. Likewise, option C of 800-1000 ppm is even higher and can lead to more severe issues. Option D, 1000-1200 ppm, is also incorrect as it is well above the recommended range and can cause damage to pool equipment. Therefore, option A of 400-600 ppm is the most appropriate level for pool water hardness and when dilution or replacement may be necessary.

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600-800 ppm

800-1000 ppm

1000-1200 ppm

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