Florida Drinking Water Operator "B" Practice Test

Direct filtration can be used where the source water is low in what?

1. Chlorine content

2. Turbidity, algae, color, and coliforms

3. pH levels

4. Iron concentration

The correct answer is: Turbidity, algae, color, and coliforms

Direct filtration is a water treatment process designed for source waters that have relatively low levels of certain contaminants, specifically turbidity, algae, color, and coliforms. When the source water has low turbidity, it indicates that there are fewer suspended particles present, making it suitable for direct filtration as this process relies on the ability to effectively remove particles from water without the need for extensive pre-treatment. The presence of algae can complicate filtration processes because it can lead to the formation of biofilms on filter media, which could clog filters and reduce efficiency. Similarly, high color and coliform counts indicate the presence of organic matter and microorganisms that would require more complex treatment processes. When these contaminants are low, direct filtration becomes feasible, as it allows for the efficient removal of remaining particulates through physical filtration methods. Chlorine content, pH levels, and iron concentration are elements that may impact treatment processes but are not the primary concern for the effectiveness of direct filtration. Therefore, the choice of low turbidity, algae, color, and coliform levels aligns well with the requirements for utilizing direct filtration effectively in water treatment.