Dechlorination support
Used to reduce residual oxidants prior to sensitive downstream steps (e.g., membranes, catalysts, certain processes).
Product Water Treatment
Sodium Metabisulfite
Reducing agent used for dechlorination (chlorine/chloramine removal) and oxygen scavenging support in industrial water treatment programs, including RO feed pretreatment and process utilities.
✓ Na2S2O5 (SMBS)
✓ Solid powder / granular
✓ Dechlorination support
✓ Oxygen scavenging support
✓ SDS/COA/TDS on request
Packaging: 25 kg bags / big bags / (other as applicable)
Documentation: SDS / COA / TDS on request
Lead time depends on grade, origin & volume
For fast quoting and correct grade matching, please share your use case (RO feed / utility water / process), any impurity limits (iron, insolubles, heavy metals), and whether you require a specific assay level.
Applications
Sodium metabisulfite is used where a controlled reducing agent is required in water treatment and industrial process operations. It is commonly applied to reduce residual oxidants (e.g., free chlorine) and to support dissolved oxygen control strategies.
- RO feed pretreatment: residual oxidant control to protect membranes (program dependent)
- Industrial utilities: process water conditioning where reductant is specified
- Wastewater and effluent programs: reducing/neutralization steps (site-specific)
- Process applications requiring sulfite source (formulation/program dependent)
Oxygen control support
Used in programs where dissolved oxygen reduction is required; final approach depends on your treatment train.
Operational fit
Solid format supports stock solution preparation and controlled dosing under EHS and process controls.
Dosing is determined by your incoming oxidant residual, flow, contact time, and water chemistry. For operational safety and performance, align calculations and verification with your water treatment program and on-site testing.
Why SMBS is specified in water treatment programs
SMBS is selected when a reliable, controllable reducing agent is needed and when procurement requires consistent assay and impurities. The right grade is determined by your system sensitivity and documentation requirements.
Reductant performance
Supports residual oxidant reduction when used under controlled dosing and monitoring.
Solid logistics
Efficient transport and storage; suitable for preparing stock solutions for metering.
Program compatibility
Commonly integrated into RO pretreatment and industrial utility treatment trains.
Spec-driven procurement
Assay and impurity limits can be defined for repeat procurement and consistent operation.
For membrane or high-sensitivity systems, impurity limits (especially iron/insolubles) and consistent assay are often the most important procurement controls.
Grade selection framework
Sodium metabisulfite is commonly specified by assay (purity), moisture, and impurity limits. For water treatment programs, the “right” grade depends on your system sensitivity (e.g., membranes, catalysts) and your documentation needs.
Assay / purity
Defines available reducing capacity. Specify a minimum assay requirement for consistency.
Insolubles
Important for filtration-sensitive systems. Define a maximum insolubles limit if required.
Metals (e.g., Fe)
Often critical for RO and high-sensitivity processes. Specify maximum metal limits where needed.
Common procurement questions
- Is this for RO feed pretreatment or general process use?
- Do you require a minimum assay and COA per lot?
- Any limits for iron, insolubles, or heavy metals?
- Packaging and storage conditions at your facility (dry storage, humidity controls)?
If you have an existing COA/TDS from your current supplier, share it in your inquiry for a like-for-like quotation.
Typical specifications & formats
Values depend on grade and customer requirements. Confirm final values on quotation (SDS/TDS/COA as applicable).
Chemical
Sodium metabisulfite (Na2S2O5)
Form
White powder / granular (grade dependent)
Assay
Per requirement (confirm on COA)
Moisture
Per requirement (confirm on COA)
Packaging
25 kg bags, big bags (as applicable)
Documentation
SDS / COA / TDS available on request
Indicative COA/TDS fields (example)
The table below lists typical specification fields used in procurement. Exact limits and values depend on the grade selected and should be confirmed on the supplied documentation.
| Property | Typical description | Why it matters |
|---|---|---|
| Assay (Na2S2O5) | Grade-dependent minimum | Defines reducing capacity and repeat performance. |
| Moisture | Grade-dependent maximum | Affects stability, storage behavior, and effective strength. |
| Insolubles | By spec (if required) | Important for membrane or filtration-sensitive systems. |
| Iron (Fe) | By spec (if required) | Critical impurity control for many water treatment applications. |
| Heavy metals | By spec (if required) | Compliance and process compatibility (site-specific requirements). |
| Appearance | White powder/granules | Basic identity and handling expectation. |
| Solubility | Water soluble (program dependent) | Supports stock solution preparation and dosing strategies. |
Specifications may vary depending on batch, origin, and packaging selection. For critical applications, request a sample and validate in a pilot.
Handling & storage guidance
Sodium metabisulfite is a reducing agent. It can release sulfur dioxide (SO2) in contact with acids and under certain conditions. Proper handling, ventilation, and PPE are required. Always follow the supplied SDS and your internal EHS procedures.
PPE (typical)
Gloves and eye protection; respiratory protection as required by risk assessment and handling conditions.
Storage
Keep sealed and dry. Protect from moisture and contamination. Store away from incompatible chemicals per SDS.
Handling notes
Avoid dust generation. Use appropriate transfer methods and keep containers closed between uses.
If you have site rules for humidity control, secondary containment, or specific labeling, include them in your inquiry so packaging and logistics can be aligned.
Supply & procurement details
Built for repeat buying: spec alignment, documentation readiness, and practical packaging options.
Packaging options
Common: 25 kg bags and big bags. Labeling and palletization can be aligned to your receiving requirements.
Documentation set
SDS/TDS on request. COA typically available by batch depending on lane and grade.
Lead time
Depends on grade, origin lane, packaging, and order size. Confirmed on quotation.
Quality alignment
Define assay + impurity limits for consistent treatment performance and easier repeat orders.
Repeat procurement
Lock a specification range (assay, Fe, insolubles, moisture) for stable long-term supply.
Commercial terms
Quotes can be structured by destination and Incoterms. Share preferred terms for faster pricing.
FAQ
Common technical and procurement questions for sodium metabisulfite (SMBS).
Is it the same as sodium bisulfite?
Sodium metabisulfite (SMBS) is a solid that can be used to generate bisulfite/sulfite species in solution depending on conditions. Specify the product form you need (solid SMBS vs. liquid bisulfite) for the correct supply lane.
What matters most for RO pretreatment?
Typically: consistent assay and low impurities (especially iron/insolubles), plus reliable batch documentation (COA) for repeat operations.
Do you provide SDS/COA/TDS?
Yes—documentation is available on request and depends on grade and supply lane.
How should it be stored?
Store sealed, dry, and away from incompatible chemicals per SDS. Moisture exposure can reduce stability and performance.
What packaging is typical?
Most common are 25 kg bags and big bags for industrial users; other formats can be discussed per inquiry.
What speeds up quoting?
Tell us: application (RO/utilities/process), assay requirement, impurity limits (Fe/insolubles), volume, packaging, destination, and docs needed.