Which mesh screen is used on water tank overflows?

The use of a #4 mesh screen on water tank overflows is preferred because it provides a good balance between preventing the ingress of debris and allowing for adequate flow capacity. The size of the mesh refers to the number of strands per square inch; a #4 mesh has openings that are fine enough to block larger particles while still permitting water to flow freely. This is essential to prevent clogging and ensure that overflow systems function effectively, avoiding potential water quality issues and structural damage to the tank.

In comparison, larger mesh sizes (like a #2 mesh) may allow larger debris to enter the system, which could compromise water quality and interfere with the operation of the overflow system. Conversely, finer mesh screens (like #8 or #12 mesh) could restrict water flow too much, especially during heavy overflow events, potentially leading to backups or inadequate drainage. Thus, the #4 mesh strikes the appropriate balance between protection and functionality for water tank overflow applications.