Calix Water Business in North America is IER (

IER offers Magnesium Hydroxide-based products as safe, earth-friendly alternatives to the use of caustic soda for pH neutralization, along with proprietary polymer solids removal technologies.

Stabilise pH and boost alkalinity

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


Has uncontrolled high pH adversely affected your treatment process ?

Trouble with your water and its alkalinity ?

Excess usage of chemical elements like lime and alum, and caustic soda leading to higher operations and maintenance cost ?


Alkalinity can be defined as the ability of a water to neutralize acid or to absorb hydrogen ions. In municipal and industrial wastewater, many factors contribute to alkalinity such as the type of dissolved inorganic and organic compounds present in the water, the amount of suspended organic matter in the water, the presence or absence of free hydroxyl alkalinity, the amount of bicarbonate in the water, or the bicarbonate to dissolved CO2 ratio etc.

The bacteria which play an active role in wastewater treatment are most effective at a neutral to slightly alkaline pH (7 to 8). Maintaining the proper pH in the wastewater as it undergoes treatment is crucial to maintaining optimal conditions for the biological activity, which is why alkalinity is so important to the wastewater industry.

ACTI-Mag to stabilise pH and boost alkalinity

ACTI-Mag has a higher neutralising value per kilo when compared with caustic whilst being significantly safer to handle than other traditional alkalis, making it a very safe and cost competitive option.

Download the Solution Spec Sheet

Key Benefits

High neutralisation potential without high pH
Reduced sludge generation making for easier disposal (lower overall costs)
Solve sodium discharge issues by substituting for caustic
Safer to handle than traditional neutralisation chemicals (Lime and Caustic)
Australian manufactured.

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Watch our Webinar: Better pH & alkalinity control

A very informative, yet brief session from Dr Doug Kelley, one of the field leaders in pH and alkalinity control – to understand the basic chemistry that lies under the pH measurement and how alkalinity and other chemicals can affect wastewater treatment. Also learn about the differences between using caustic, lime and soda ash for pH control or  the cost benefits of using Magnesium Hydroxide products.

more webinars


When an alkaline compound dissolves in water it produces hydroxide ions, OH- . These ions are responsible for the alkalinity of the solution.

Because Magnesium Hydroxide Mg(OH)2 provides two hydroxides for alkalinity compared to one with NaOH caustic soda, the usage rate for Mg(OH)2 is much less than that required for NaOH.


Neutralisation rate depends on how readily the solids dissolve to form an alkaline solution. ACTI-Mag is produced with Calix’s own highly reactive Magnesium Oxide (MgO) produced using Calix Flash calcination process. This short contact heat treatment (less than 10 sec) rapidly converts the Magnesium carbonate ore (MgCO3) to MgO by driving off CO2. As the CO2 is ‘fizzled-off’ from the fine ground mineral particles, it produces a highly porous mineral ‘honeycomb’ leaving a very high surface area. This allows for rapid hydration to MHL & the resultant high surface, reactive ACTI-Mag product is more readily released by dissolution to allow a significantly higher rate neutralisation than other low surface area, low reactivity MHL products.

ACTI-Mag lowers chemical consumption and ensures easier use, handling and storage, considerably reducing costs.


Lower cost-per-litre does not necessarily mean cheaper, it may mean lower solids concentration or low active ingredient availability due to low reactivity.
The concentration of active ingredients in Magnesium Hydroxide Mg(OH)2 impacts on the neutralisation time.

More solids (higher level of MHL per volume) = Lower required dose

At a 30% solids concentration, MHL can take more than twice the dose to achieve the same neutralisation capacity as the amount of ACTI-Mag, which would result in significantly higher annual consumption costs.

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 Savings Calculator.

Use our Savings Calculator

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The Calix difference

People, unique technology, partners, and track record

Leading edge technology

Calix core technology makes high surface area materials (with a honeycomb-like structure), giving you a price and a reactivity advantage.

Our materials are proving to have similar properties to highly active nano-materials, without the health/safety concerns and high cost, but with all the benefits.

Faster reactivity = less costs

Manufactured in Australia

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.

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

We work together in ways others don’t, considering the long-term effect of our actions, never satisfied with the status quo.

Calix has its own direct delivery, service and support capabilities and also has an established a network of local distributors and partners that can provide the best solution for your specific needs and ensure you receive excellent customer service and support, wherever you are located.

Got a question? Want a quote?


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