RoQuest™ FS - Avista Membrane Treatment Solutions
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RoQuest FS

RoQuest FS liquid coagulant contains ferric sulfate and is designed for use as a flocculant in direct filtration applications. This coagulant enhances filter performance by removing colloids, silt, and many organic molecules to produce an improved filtrate that will reduce downstream reverse osmosis (RO) and nanofiltration (NF) membrane fouling.

Performance Benefits

  • Contains more than 12% soluble ferric ion.
  • Approved for offshore use.
  • Filter-aid properties resist solids breakthrough in direct filter applications.
  • Low dosage requirements and effective over a wide pH range.
  • Capable of producing RO-quality feedwater in multimedia and sand filters.
  • Compatible with polyamide and cellulose acetate RO membranes.
  • Compatible with all Vitec antiscalants.
Product Data Sheet
Download Product Information Sheet – RoQuest FS
Safety Data Sheet

If you would like to request a Safety Data Sheet, please email Avista Compliance and Regulatory at, call your regional distributor, or click to submit your request.