When filling a line with water, what is the recommended method?

Filling a line with water from the lowest point to the highest point is recommended to ensure that any air trapped within the line can escape effectively. When water is introduced at the lowest point, it allows for a smooth and gradual filling of the system. As water rises, it pushes the air upwards and out of any high points in the line or system, preventing potential air locks that can hinder the flow and affect performance.

This method promotes proper water flow and system operation, which is essential in various water treatment processes. Additionally, filling from the lowest point helps maintain pressure and prevents the risk of negative pressure scenarios that could draw contaminants into the system. The other options do not provide the same assurance of air displacement and may lead to operational inefficiencies or complications within the water line system.