Rapid head loss increase may ...

Rapid head loss increase may be caused by several factors:

1. Poor raw water quality, high coagulant dosages, i.e. high sludge production/high solids load to the filter

2. Too high filtration rate combined with too high solids load (too high solids load). The higher the filtration rate, the shorter the filter runs...

3. Too high polymer doses (if used), may cause depositions in the upper part of the filter bed only

4. Poorly designed filters - with poor distribution of filter deposits over the filter depth (dual media filtration performs much better than single medium sand filters)

5. Inadequate pre treatment - if used (e.g. poor flocculation: too large, and too strong (polymer aided)  flocs for the filter pores); poor sedimentation), etc

"There is no such thing as a good filter - it depends on the water too be filtered...."