Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

To achieve an effective chlorine dosage in large quantities, which method is least efficient?

1. Using a ton cylinder

2. Using gas chlorinators

3. Manual dosing with liquid chlorine

4. Using tablet chlorinators

The correct answer is: Manual dosing with liquid chlorine

To achieve an effective chlorine dosage in large quantities, manual dosing with liquid chlorine is considered the least efficient method. This is primarily due to the variability and control issues associated with manual dosing. When manually dosing, it is easy to introduce human error, potentially leading to inconsistent chlorine levels in the water. It requires frequent monitoring and adjustments, making it less efficient for large-scale operations. Additionally, the process can be time-consuming and may not respond quickly enough to changes in water demand or quality. In contrast, other methods such as using ton cylinders, gas chlorinators, or tablet chlorinators are designed to provide a more automated and consistent dosing of chlorine. These methods allow for better control over dosage rates, ensuring that the required levels of chlorine are maintained more effectively and without the need for constant manual intervention.