17 DEC 2003
Complete the Flow Diagram.
Figure C-3. Schematic of a Continuous Downflow Backwash Filter
Criticality of Operation. Consult with the user and the rest of the design
team to determine whether part or all of the unit operation can be shut down for mainte-
nance. If bypassing is not an allowable option, storage and treatment at a higher rate
may be essential. A frequently cited advantage of continuous backwashing filters is
elimination of backwash storage and repumping. Verify the relative cost effectiveness of
providing spare flow through capacity versus storage and pumping. Determine whether
a spare filter or storage and repumping is the best solution for filter outages.