Solutions for municipal water and wastewater

Climate change coupled with population growth result in wastewater becoming an increasingly critical challenge for all councils and water utilities.

A growing sewer network create issues such as infrastructure damage, odour complaints and potential health and safety hazards, as well as accelerated corrosion of sewer assets, pump station wells, discharge manholes and treatment plants.

Trends and challenges facing water utilities today

With rapid urbanisation and development, there is an increasing pressure on water utilities to find safer and more sustainable solutions to prevent odour, protect existing and new infrastructure, and improve wastewater treatment performance.

A fast-growing sewer network and the disposal of untreated or poorly treated wastewater in natural waterways can lead to dramatic consequences on biodiversity, the quality of our water resources and the health and safety of people.

While wastewater management and pollution prevention are a priority, waste-to-energy programs can also help improve the productivity of treatment facilities by maximising the economics of biogas generation from anaerobic systems.

Our solution

ACTI-Mag, a high surface area magnesium hydroxide solution

ACTI-Mag is non hazardous, non-toxic and has a very low solubility, which makes it perfect for acid neutralisation, and hydrogen sulphide gas (H2S) control in sewers, while maintaining the water quality for any kind of downstream use.

Find out more on ACTI-Mag

Our engineered and cost-effective chemical dosing solutions are tailored to meet your specific needs, budget and quality expectations.


Odour control
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Fats, oils, greases (FOGs) control
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Phosphorus (P) and Nitrogen (N) removal
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pH adjustment and alkalinity boost
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Caustic soda replacement
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Chemical dosing units
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BOD/COD reduction
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Biogas management
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ACTI-Mag Success Stories

July 09, 2019 \ ACTI-Mag \ Improving the Sustainability of Water Treatment \ Municipalities
Magnesium Hydroxide liquid dosing for odour control, Cassowary Coast Regional Council

Replace lime and alum with Calix’s ACTI-Mag magnesium hydroxide liquid at Cassowary Coast Region, QLD, Australia.

November 12, 2019 \ ACTI-Mag \ Improving the Sustainability of Water Treatment \ Municipalities
Minimising odours in Hobart, TasWater

TasWater minimises odours at Hobart with Calix’s ACTI-Mag and Netco Pumps.

November 12, 2019 \ ACTI-Mag \ Improving the Sustainability of Water Treatment \ Municipalities
Odour control demonstration at a regional NSW council

ACTI-Mag reduces H2S and consequently odours at a regional NSW council.

Chemical dosing systems

Calix leverages a culture of innovation to provide fully customised services such as design expertise, engineering know-how, detail engineering, installation, commissioning and reporting services to provide turnkey systems for chemical dosing of Magnesium Hydroxide Liquid (MHL).

Quick to install – our modular dosing units can be delivered on site by truck and are fast to set up and connect.

Find out more about our dosing solutions

Relevant articles

December 17, 2020 \ Calix Global Challenges
pH & Alkalinity – How are they related?

The relationship between pH & alkalinity is intimately connected with the chemistry of the aqueous bicarbonate equilibrium system. 

August 05, 2020 \ Improving the Sustainability of Water Treatment
Magnesium hydroxide vs caustic soda / sodium hydroxide demonstration

A safe and cost effective alternative to the use of sodium hydroxide (caustic soda) for wastewater alkalinity and pH adjustment.

June 27, 2020 \ Improving the Sustainability of Water Treatment
Magnesium hydroxide as a substitute for caustic soda and lime

Magnesium hydroxide is the least expensive and most powerful alkaline chemical treatment available on the market for pH control applications.

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