Avista Technologies
RoQuest 4000/d

Details:

Avista RoQuest 4000/d 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 turbidities 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. Best results are achieved in raw waters with upper limits of turbidity and color (10 NTU and 10 units, respectively) or in feedwaters where organic polymers have been under- or overdosed. 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 Avista VT 3000, 3025, 5100, and 7000.

Technical Documents:

• Avista RoQuest 4000 Datasheet 05.2021