What is the minimum head recommended to prevent air binding in a gravity filter?

To prevent air binding in a gravity filter, maintaining a minimum head of 5 feet is crucial. Gravity filters rely on a consistent downward flow of water through the filter media. If the water level drops below a certain point, air can be drawn into the system, leading to air binding, which can disrupt the filtration process.

A head of 5 feet provides sufficient pressure to keep the filter media saturated and ensures that the water can flow freely. When the water level is too low, it can create a vacuum effect, allowing air pockets to form, which blocks the flow of water and reduces the efficiency of the filter. Maintaining this minimum head encourages a steady flow rate and minimizes the potential for operational issues, thereby supporting the effective treatment of water.