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.

Magnesium hydroxide

A solution to the problems of caustic soda

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  • Feel you are paying too much for your alkali?
  • Looking at a safer alternative to caustic soda for pH control in your nitrification process?
  • Want a greener alkaline additive for your wastewater treatment?
A safer, greener and more cost effective alternative to caustic soda

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.

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Better for your budget

While Magnesium hydroxide Mg(OH)2 is typically more expensive on a “price per unit” basis, it is significantly less expensive in use.

Every 1.0 kg of 50% NaOH can be replaced by 0.6 kg of 60% Mg(OH)2 to provide the same number of moles of hydroxide (OH-) for pH neutralization.

                                   Check the comparison table

Better for your system

Magnesium hydroxide Mg(OH)2 (unlike sodium hydroxide NaOH) has coagulation properties. This means:

  • more solids content of sludge on dewatering device
  • less sludge volume
  • less sludge hauling fees
                                   Check the comparison table

More alkalinity

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.

The ‘vinegar test’

In this simple benchtop experiment, we will demonstrate that magnesium hydroxide provides more CaCO3 equivalent alkalinity on an equal weight basis when compared to caustic soda, which means less chemical consumption and can result in significant cost savings.

Magnesium hydroxide is also non-hazardous and non-corrosive which makes handling safer and easier.

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Better for people

Nonhazardous for employees to handle, spill is not reportable.

                                   Check the comparison table

Better for the environment

Magnesium is a macronutrient, core element of chlorophyll (makes everything green) – while sodium is a salinity hazard.

                                   Check the comparison table

Safer and greener means further savings

Unlike caustic soda, ACTI-Mag is non-hazardous and non-corrosive, which makes it easier and safer to handle. Spill is not reportable.

Because magnesium is a macronutrient – it is the core element of chlorophyll (makes everything green!) – it is also beneficial to the environment while sodium is a salinity hazard.

Magnesium also has coagulation properties that sodium does not. This can result in reduced sludge volume and reduced sludge hauling fees.


Improved solids settling

The wastewater stream for many industrial processes can be quite unpredictable and inconsistent. Dramatic changes in pH can have adverse effects on the settleability of suspended solids. To stabilise the pH, the wastewater is commonly neutralised with alkalis. The nature of the alkali selected can have a dramatic impact on the ability to settle suspended solids.

Caustic soda typically provides no settling benefit and often results in gelatinous sludge that does not dewater easily. With lime (Ca(OH)2) there is typically a significant increase in sludge volume due to the formation of calcium minerals, like calcium carbonate (CaCO3).

Got a wastewater challenge?

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