When should a filter be backwashed?

Backwashing a filter is a process used to clean the filter media by reversing the flow of water through the filter, helping to remove accumulated particles and debris. The optimal time to perform this backwashing is when specific conditions indicate that the filter’s performance has been compromised. High head refers to an increase in pressure, which typically happens when the filter becomes clogged. Turbidity breakthrough signals that the filter is no longer effectively removing suspended particles from the water, indicating a need for maintenance. Additionally, some treatment facilities schedule backwashing during designated hours to ensure consistent cleaning and optimal operation without interfering with peak demand times.

This practice ensures that filters maintain their efficiency and effective contaminant removal capabilities. Conducting backwashing based on pressure levels, turbidity outcomes, or pre-established time frames is crucial for maintaining the quality of treated water and the longevity of the filtration system. Other scenarios, such as backwashing when chemical levels are low, do not provide a direct indication of filter performance and would not ensure effective cleaning of the filter media.