Brief Overview:
Magnesium hydroxide is an inorganic compound with the chemical formula Mg(OH)2. In wastewater treatment, it can be used to provide alkalinity and pH controllers. Magnesium Hydroxide is generally in white solid form, odorless, flammable, and insoluble in water.  

Manufacturing Process:
Magnesium Hydroxide can be produced by combining alkaline water with aluminium salts which induces precipitation of solid Mg(OH)2. The main reaction is:
Mg2+ + 2OH− → Mg(OH)2
Generally, Mg(OH)2 can be formed by treating seawater and combined with lime (Ca(OH)2). The total volume of seawater is about 600 m3 and gives a result of around one ton of magnesium hydroxide.

Waste Treatment Industry In wastewater treatment, Magnesium Hydroxide can be used to provide alkalinity and pH controllers.

Pharmacy Industry Magnesium hydroxide is marketed for medical use as chewable tablets, as capsules, powder, and as liquid suspensions, sometimes flavored. These products are sold as antacids to neutralize stomach acid and relieve indigestion and heartburn.

Other Industry Magnesia is valuable because it is both a poor electrical conductor and an excellent thermal conductor