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!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Green water that is transparent is usually due to __________.

algae
copper ions in the water
iron particles
organic debris

The correct answer is: algae

Green water that is transparent is usually due to algae. Algae are microscopic organisms that can make the water appear green when they are present in large numbers. Algae can thrive in warm, sunny conditions and can quickly multiply in pool water if the sanitizer levels are not properly maintained. Keeping the chlorine levels balanced and regularly shocking the pool can help prevent algae growth and keep the water clear. Copper ions in the water, iron particles, and organic debris can also cause water discoloration, but they do not typically result in transparent green water.