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Bulking filament bacteria can be difficult to indentify.  Typical contributors include low D.O., nutrient deficiency, and low F:M.  If you experience problems from any of these filaments call us at 1-888-757-9577 or visit our Lab Services page.  We will work with you to resolve the conditions.

  • Filaments with sulfur deposits – these common filaments use sulfur as their energy source and are usually, but not always, present in septic conditions.  Staining reveals sulfur deposits in the cell structure.
  • Beggiatoa – caused by organic overloading, low D.O.
  • Haliscomenobacter hydrosis – caused by low DO, and possibly phosphate deficiency.
  • Sphaerotilus natans
  • Thiothrix I & II – generally occurs with septic compounds and low DO
  • Type 0041
  • Type 021N
  • Type 0675
  • Type 0914 – caused by low F:M and septic wastes
  • Type 1701 – caused by low DO
  • Type 1851
  • Zoogloea



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