Chlorination for Filament Control
Low-dose RAS chlorination selectively targets filaments extending outside the floc, without killing the whole biomass.
Because filaments extend beyond the floc's protective structure, they're exposed to a chlorine dose that floc-forming bacteria inside the structure are partly shielded from.
Typical starting dose is low, often 1-3 lbs chlorine per 1,000 lbs MLSS per day, then adjusted based on filament index response over several days.
Overdosing damages floc-forming organisms too and can worsen settling; this is a control tool to buy time while the root cause (DO, F/M, septicity) is fixed, not a substitute for fixing it.
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