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ACTI-Mag for wastewater

An innovative and environmentally friendly solution for wastewater treatment.

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Focusing on wastewater management and corrosion prevention, we’ve developed innovative materials and a cost-effective approach that help utilities, councils and industry manage wastewater without compromising the planet.

Alkalinity & pH adjustment

ACTI-Mag provides more CaCO3 equivalent alkalinity on an equal weight basis when compared to hydrated lime and caustic soda which lowers chemical consumption. Unlike caustic soda, ACTI-Mag is non-hazardous and non-corrosive, and even beneficial to the environment while sodium is a salinity hazard.

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BOD/COD reduction

Reducing BOD means that the sewage will support the growth of less bacteria and therefore the effluent will be better able to infiltrate tight soils. We can help you reduce the organic component from your wastewater streams.

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Caustic soda (sodium hydroxide) replacement

While ACTI-Mag is typically more expensive than 50% NaOH on a “price per unit” basis, it is significantly less expensive in use – because every 1.0 kg of 50% NaOH can be replaced by 0.6 kgs of 60% Mg(OH)2 to provide the same number of moles of hydroxide (OH-) for pH neutralization.

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Fats oils and greases (FOGs) control

Higher concentration of FOG can lead to the formation of fat bergs, scamming, pump blockages, pipe restriction, pipe blockage plus the formation of odour related issues like hydrogen sulfide gas (H2S). ACTI-Mag is a safe and environmentally friendly solution for FOGs in wastewater

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Odour and H₂S control

Hydrogen sulphide is present due to anaerobic activity, which favours sulfate reducing bacteria (SRB) and results in the generation of a poisonous rotten egg gas called H2S. Unlike other agents, which can be costly, potentially hazardous, and targeted at a single issue, ACTI-Mag offers a safe and cost-effective strategy for managing odour.

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phosphorus removal

Phosphorus – usually in the form of phosphates – has to be treated and reduced from the wastewater in order to meet environmental standards before it is discharged into a local water body, or land irrigation. With a chemistry similar to the antacids used in our human digestive systems, Calix can safely and cost-effectively remove phosphate from municipal and industrial wastewater.

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ACTI-Mag Savings Calculator

Feel you are paying too much for your alkali?
Looking at a safer alternative to caustic soda for pH control in your nitrification process?

To see how much you could save by switching to ACTI-Mag, use our saving calculator.

Chemical dosing systems

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

Our engineered and cost-effective solutions are tailored to meet your specific needs and budget. 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


Fully integrated supply chain – from mine to customer

Calix is able to offer better service, reliability and performance to its
customers because it controls the entire production process from mining
of raw materials, processing and production.


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.

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.

Improving the Sustainability of Water Treatment \
Chrome Precipitation at a tannery, Casino Hide Tanners

ACTI-Mag is a highly reactive, concentrated and stabilised suspension of Magnesium Hydroxide manufactured by hydrating ultra high surface area Magnesium

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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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This partnership with WaterAid aligns perfectly with our purpose and the reason to why we exist “We Solve Global Challenges” and with our core value of “positive impact”.

Looking for a safety data sheet (formerly known as MSDS)? All our SDS are available on our website.