RoQuest™ 4000, Polymer Coagulant - Avista™
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RoQuest 4000

RoQuest 4000 liquid coagulant is an organic polymer and ferric sulfate blend used to enhance the removal of a broad spectrum of inorganic particulates, organics, silt, and colloids in multimedia filters. This multicomponent polymer and iron salt coagulant is formulated for waters with high organics and turbidites higher than 2.0 NTU. Although this product is membrane compatible, overfeeding of pretreatment chemicals is not recommended as it can affect organic and particulate removal. RoQuest 4000 is injected into the feedstream of multimedia and sand filters to enhance filter performance by reducing turbidity and color to produce an improved filtrate that will reduce downstream reverse osmosis (RO) and nanofiltration (NF) membrane fouling. RoQuest 4000 is NSF approved.

Performance Benefits

  • 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 and Avista antiscalants, including Vitec 3000, 3025, 5100, 7000.


Product packaging and labels may vary. These images represent packaging and labels for products manufactured and fulfilled by Avista Technologies Inc. in the United States.

Product Data Sheet
Download Product Information Sheet – RoQuest 4000
Safety Data Sheet

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