Why It Matters
Plants must neutralize residual free and combined chlorine before NPDES discharge or before it reaches chlorine-sensitive RO/nanofiltration membranes. Buyers dose sulfite-family reductants in bulk through metering systems, making sodium metabisulfite a large recurring commodity buy
Solution Approach
Plants must neutralize residual free and combined chlorine before NPDES discharge or before it reaches chlorine-sensitive RO/nanofiltration membranes. Buyers dose sulfite-family reductants in bulk through metering systems, making sodium metabisulfite a large recurring commodity buy RawSource supplies the base chemicals that go into these programs. We can help with product selection, grade matching, and sourcing from multiple origins for supply security.
Typical Treatment Workflow
1
System Assessment
Characterize operating conditions—fluid composition, temperature, pressure, flow rates—and benchmark current treatment performance.
2
Chemistry Selection
Match base chemicals to your operating envelope. Factor in compatibility with existing programs, regulatory constraints, and downstream impacts.
3
Dosage & Delivery
Determine optimal treat rates through jar testing or field trials. Configure packaging (drums, totes, ISO tanks) to match consumption and storage logistics.
4
Monitoring & Adjustment
Track KPIs—coupon rates, residuals, separator performance, water quality. Adjust chemistry and dosage as conditions change.
Recommended Chemistries (6)
Sodium Bisulfite
CAS 7631-90-5
Specialty Additives
Liquid sulfite scavenger
3260 (SODIUM BISULFITE) · Class In catalog. Bisulfite reduces free chlorine/hypochlorite to chloride and is oxidized to sulfate, removing chlorine residual in seconds
Melting Point: Decomposes Boiling Point: Decomposes Density: 1.48 at 20 °C
Full Details
Potassium Metabisulfite (Technical/Food Grade)
CAS 16731-55-8
Specialty Additives
Preservation
1759 (POTASSIUM METABISULFITE) · Class In catalog. Dissolves to release bisulfite, the active reductant for chlorine removal; dry form is convenient for makedown
Melting Point: Decomposes at approximately 150 °C Density: 2.3 g/cu cm Solubility: Freely soluble in water; insoluble in alcohol
Full Details
Sodium thiosulfate
CAS 7772-98-7
Acids & Salts
Preservation
In catalog. Mild reductant that quenches chlorine and chloramine, favored where over-reduction of dissolved oxygen must be avoided
Melting Point: 48.5 °C Density: 1.667 Solubility: PRACTICALLY INSOL IN ALCOHOL
Full Details
Ammonium Bisulfite, 60%
CAS 10192-30-0
Acids & Salts
Ammonium-based scavenger
2693 (AMMONIUM BISULFITE, SOLID) · Class In catalog. Liquid bisulfite source for high-volume dechlorination and oxygen-scavenging dosing skids
Melting Point: -10 °C Boiling Point: Sublimates at 150 °C Density: 2.03 at 20 °C 1.40 (72% aqueous solution)
Full Details
Sodium metabisulfite
CAS 7681-57-4
Specialty Additives
Preservation
1759 (SODIUM METABISULFITE) · Class Sourced on demand. The most-searched dechlorination active; in water it forms bisulfite that reduces chlorine to chloride
Melting Point: > 150 °C (Decomposes) Boiling Point: Decomposes Density: 1.4
Full Details
Ascorbic Acid (Vitamin C), Food Grade
CAS 50-81-7
Acids & Salts
Preservation
Sourcing option. Reductant used where sulfite residual or pH depression must be avoided, e.g. sensitive receiving-water dechlorination
Melting Point: 190–192 °C (decomposes) Density: 1.65 Solubility: ≥ 100 mg/mL at 23 °C
Full Details