Aluminium Sulphate (Alum) Supplier — Vadodara, Gujarat

Aluminium sulphate (alum) in lump and powder form remains the lowest-cost coagulant for municipal water works and small ETPs in Gujarat where sludge handling capacity is adequate. Drashti Chemicals supplies non-ferric alum meeting IS 260 specification with COA on Al₂O₃ content and iron as Fe — the iron figure determines whether your treated water picks up colour on chlorination.

Non-ferric alum (Fe < 0.01%) is mandatory for potable water and food-process RO pretreatment; ferric alum (1–2% Fe) suffices for industrial ETP primary clarification at lower cost. If your filtered water shows tea-brown tint after chlorination, your alum iron content is too high — upgrade to non-ferric. Drashti labels grade clearly on invoice and COA so your storekeeper does not mix grades across bays.

Dissolve alum at 8–10% w/v in a concrete or FRP saturator tank with sludge draw-off at bottom — undissolved clay and silica settle daily. Dose saturated solution at 20–150 mg/L as Al₂O₃ depending on raw turbidity. Alum consumes alkalinity; monitor pH post-dose and add lime or soda ash if pH drops below 6.5. Winter dosing may need 15–20% higher rate as water temperature falls below 15 °C.

Packaging: 50 kg HDPE bags, lump or powder as specified. MOQ one bag for jar-test trial; bulk quote on request for 10 MT+ monthly to water boards and industrial parks. Dispatch from Vadodara within Gujarat typically 24–48 hours. MSDS and COA supplied. Store dry — alum hygroscopes and forms hard blocks that jam saturator rakes.

Alum vs. PAC: alum costs less upfront but generates more sludge and requires alkalinity supplement; PAC produces denser floc with less sludge at 30–50% lower dose by weight. Alum vs. ferric chloride: alum works at lower corrosivity and without chloride TDS addition; ferric wins on phosphate and colour. For plants upgrading from alum, run parallel jar tests — payback on PAC often comes from reduced sludge disposal within six months.