If short filter runs are occurring due to high head loss, what should be reduced?

When experiencing short filter runs due to high head loss, one effective approach is to reduce the dosage of filter aids such as polyelectrolytes. These chemicals are added to enhance the filtration process by promoting flocculation and improving particle removal. However, excessive amounts can lead to an accumulation of materials on the filter media, which can inevitably increase head loss and result in a shorter filtration cycle.

By reducing the filter aid dosage, the load on the filter is decreased, allowing for more efficient filtration and reducing the buildup of residuals that contributes to high head loss. Therefore, managing the amount of filter aid used directly addresses the issue of short filter runs due to the physical constraints on the system.

In contrast, adjusting backwash frequency or modifying water temperature may not directly resolve the immediate issue of head loss caused by filter aid accumulation. Altering influent flow rate may also affect overall system performance, but the root cause of high head loss related to filter aids specifically calls for a reduction in their usage.