Multimedia Filter Turbidity Breakthrough: Causes and Backwash Checks
Check whether breakthrough occurs at startup, late in the run or continuously. Inspect backwash flow and bed expansion, service rate, media condition, valve leakage, underdrains and coagulation before replacing all media.
Use the plant chemical-handling procedure, suitable PPE and lockout/tagout. Depressurize housings and verify that cleaning chemicals have been displaced before opening a pump, filter or membrane vessel.
Locate the fault
- Filtered-water turbidity spikes after backwash
- Run length becomes progressively shorter
- Media appears in downstream strainers
- Differential pressure stays low despite poor filtration
Inspection sequence
- Trend inlet and outlet turbidity through an entire service and backwash cycle
- Measure actual service and backwash flows using calibrated instruments
- Observe bed expansion where the vessel design safely permits
- Review air-scour, backwash and rinse valve sequence
- Inspect downstream for media type and particle evidence
- Perform an approved internal inspection if hydraulic data indicates channeling or underdrain damage
Corrective work
- Restore required backwash flow, sequence and final rinse
- Reduce service rate or bring additional filter area online
- Regrade or replace lost and mixed media after correcting the cause
- Repair bypassing valves, distributors or underdrains
Operating records and follow-up
- Verify backwash hydraulics rather than relying only on timer settings
- Trend turbidity at startup and end of run
- Inspect media loss indicators
- Calibrate flow instruments
- Review filter loading after raw-water changes
Equipment details: Water Filtration System.
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