Aluminum Sulfate Solution (Iron Free)

Aluminium Sulfate Free from Iron is a liquid alum coagulant which we produce by dissolving aluminium trihydrate into water and sulphuric acid. It contains more than 8.0% Al₂O₃ and has iron kept at a maximum level of 50 ppm; it satisfies the AWWA Standard B403-24 and complies with NSF/ANSI/CAN 60 at a maximum dosage of 150 mg/L. In cases where iron would cause staining, discoloration or poisoning of a process that comes after it, this is the alum that should be put into the tank.

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Why iron-free matters

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Standard alum contains iron as a result of the raw materials used to produce it. In the majority of municipal water clarification processes the iron is not harmful. However, in some places it is a costly factor.

• Catalyst manufacturing — iron is a catalyst poison, so alumina feedstock chemistry has to stay clean
• Pulp and paper — iron drives brightness loss and specking in the sheet
• Textile dyeing — iron shifts shade and dulls color in mordanting
• Potable water — iron contributes to color and consumer staining complaints

We limit the amount of iron to a maximum of 50 ppm and keep the water-insoluble material below 0.2 per cent, which ensures that the solution remains clear with no visible particles and keeps your feed lines clean.