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A safe solution for H2S control, odour management, phosphate and heavy metal treatment, and enhanced bio-treater performance.
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A safe solution for H2S control, odour management, phosphate and heavy metal treatment, and enhanced biotreater performance.


ACTI-Mag™ is a concentrated stabilised suspension of magnesium hydroxide, an inorganic compound with the chemical formula Mg(OH)2. Because it is manufactured in Calix's patented calcining technology from highly reactive magnesium oxide powder, ACTI-Mag™ imparts superior neutralisation capacity and speed, while being safer to handle than other traditional alkalis.




  • Sewer odour control
  • Phosphorus removal from wastewater
  • Enhancement of biogas production
  • Neutralisation of wastewater
  • Sewage sludge treatment


ACTI-Mag™ has a higher neutralising value per dry kilo when compared with caustic and lime, which lowers chemical consumption, making ACTI-Mag™ a cost competitive option due to the reduction in plant and equipment requirements. Click on the table below to see our comparison guide with common alkalis.


ACTI-Mag™ is also used extensively for hydrogen sulphide gas (H2S) control in sewers and industrial waste treatment systems. Highly fluid, ACTI-Mag™ has proven to flow easily in most dosing systems.


The unique properties of Calix's ACTI-Mag™ product also include superior phosphate removal and enhanced biogas generation in sewerage and bio-waste treatment plants. ACTI-Mag™ is also effective for neutralisation and heavy metal capture in water treatment plants, flue gas treatment (sulphur dioxide, chloride removal), sugar and chemical processing. 


   Engineering support & quality you can count on


Our team of dedicated, qualified researches, engineers and project managers provide tailored technical solutions from R&D and concept/feasibility studies right through to full EPC-type projects. Our AS/NZS ISO 9001 certified quality system and safety, health and environmental management system are vital elements of our engineering and quality services.



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