Learn how to calculate detention time. For water and wastewater operators. If you're preparing for the water treatment operator certification exam, check out this book on Practice Exams: http://amzn.to/2atFJfv For more practice problems, go to http://www.waterandwastewatercourses.... .  

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How to calculate detention time

Learn how to calculate detention time. For water and wastewater operators. If you're preparing for the water treatment operator certification exam, check out this book on Practice Exams: http://amzn.to/2atFJfv

For more practice problems, go to http://www.waterandwastewatercourses.... .

 

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