Water treatment/ CALCULATOR
Filter backwash flow and water use
Check the backwash flow required by a cylindrical media vessel against the water supply available at the filter.
Use the actual inside diameter from the vessel or equipment data, not the nominal pipe size.
Use the media manufacturer’s value at the relevant water temperature.
Use the programmed or manufacturer-specified backwash step duration.
Use a measured sustainable flow at the pressure expected during backwash.
Media-bed cross-sectional area
0.049 m²
Required backwash flow
24.5 L/min
Water used per backwash step
245 L
Available-flow margin
10.5 L/min
Interpretation:Available flow exceeds the simplified backwash requirement by 10.46 L/min. Still verify pressure, drain capacity and the exact media data.
A circular vessel, uniform manufacturer-specified surface loading and constant flow for the entered duration are assumed. The calculation does not determine the correct loading, bed expansion, drain capacity, valve loss, minimum pressure, well recovery or regeneration sequence. Verify all of these with the exact media and control-valve data.