| Applications for sand filtration: |
A sand filter has a dirt holding capacity of 3 to 6 kg TSS / m2 of sand surface.
When the filters are loaded with particles, the flow direction is reversed and the flow is increased to clean the filter again. This step is called a backwash.
The time for the cleaning is determined by one of the following criteria:
- Queda de pressão ao longo do filtro
- Tempo de operação