Sodium Metabisulphite (SMBS) Supplier — RO Dechlorination

Sodium metabisulphite (Na₂S₂O₅) serves as reducing agent, chlorine neutraliser, and preservative across textile bleaching, food processing, and water dechlorination in Gujarat. Drashti Chemicals supplies industrial grade with COA confirming SO₂ release equivalent — the functional spec that matters when you are dosing to hit residual chlorine below 0.1 mg/L before RO or bio-reactor inlet.

Food-grade vs. industrial grade: industrial grade covers ETP dechlorination, leather processing, and chemical synthesis; food-grade (lower heavy-metal limits) required for sugar bleaching, starch modification, and export food lines. Metabisulphite releases SO₂ on contact with water or acid — store away from oxidisers and acids. Drashti labels grade and provides MSDS with first-aid for SO₂ inhalation exposure.

Dechlorination dose: approximately 2.5 mg/L metabisulphite per 1 mg/L free chlorine residual — verify with ORP or DPD test. Overdose leaves excess SO₂ that consumes dissolved oxygen in bio-reactor — monitor DO after dechlorination tower. For textile after-wash, 1–3 g/L in reduction bath clears residual peroxide and chlorine. Dissolve in water at 5–10% stock; solution degrades in 24 hours — make fresh daily.

Packaging: 25 kg and 50 kg HDPE bags. MOQ one bag; bulk quote on request for 1 MT+ monthly to textile processors in Surat and Ichalkaranji. COA and MSDS per batch. Store cool, dry, ventilated — bags swell if moisture ingress occurs. Drashti Vadodara (GST 24AGLPC6288M1ZX) delivers across Gujarat within 48 hours on standard PO.

Metabisulphite vs. sodium bisulphite: metabisulphite has higher SO₂ equivalent per kg and longer shelf life when dry; bisulphite is pre-dissolved liquid convenience. Metabisulphite vs. activated carbon for dechlorination: chemical reduction is faster and measurable; carbon is passive but handles broader organics. For RO pretreatment after hypochlorite disinfection, metabisulphite remains the standard Gujarat practice.