RoQuest-4000

Summary

Product identification

• Product Name: RoQuest® 4000
• Product Type: Liquid coagulant
• Formulation: Organic polymer and ferric sulfate blend

Product information

• Appearance: Clear, dark brown liquid
• pH (1% solution): 2.0-3.0
• Specific gravity (@25°C): 1.3-1.4
• Soluble ferric ion: > 8%
• Ferrous ion: < 0.2%

Operating limits

• Recommended raw water limits: Turbidity up to 10 NTU, Color up to 10 units.
• Injection point: At least 15 feet (5 m) upstream of multimedia filters.
• Mixing: Do not use static mixers ahead of filters; shear can degrade polymers.

Dosing

• Typical dose: 2-25 mg/l
• Alkalinity requirement per mg/l RoQuest 4000: Approximately 0.25 mg/l alkalinity (as CaCO₃)
• Residual alkalinity: Minimum 25 mg/l required after coagulant addition.
• Overdosing: May degrade filtered water quality.

Dilution

• Recommended: Feed neat if possible.
• Maximum dilution ratio: 4:1 with RO permeate or deionized water.

Performance benefits

• Enhances removal of inorganic particulate, organics, silt, and colloids in multimedia filters.
• Formulated for membrane applications, including brackish and seawater surface waters.
• Reduces turbidity and color, leading to improved filtrate quality.
• Reduces downstream RO and NF membrane fouling.
• Filter-aid properties resist solids breakthrough.
• 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 Avista antiscalants (Vitec® 3000, 3025, 5000, 5100, and 7000).

Packaging and Storage

• Available formats: Pail (45 lb / 23 kg), Drum (500 lb / 300 kg), IBC tote (2500 lb / 1500 kg).
• Drumless or bulk tanker delivery available on request.

Disclaimer Extraction may miss figures, footnotes, or revisions; contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror