What type of water is required to backwash the multimedia filter?

The correct type of water required to backwash a multimedia filter is fresh water. This is because freshwater is needed to effectively remove the accumulated debris and particles trapped within the filter media during the backwashing process. Fresh water helps to suspend and flush out the contaminants, allowing the filter to restore its operational efficiency.

Brackish water, which is a mix of freshwater and seawater, and brine, which is highly concentrated saltwater, may introduce additional solids or harmful particles into the filter system, which can complicate the backwashing process or degrade the multimedia filter's effectiveness. Sea water, similarly, contains salt and other minerals that could negatively impact the filter media and overall filtration system. Therefore, the use of fresh water is essential for optimal filter maintenance and performance.