Which Chemicals Are Used To Purify Water?

Depending on the quality of the feed water, and the final quality of water desired a variety of chemicals, or, no chemicals at all might apply. However, as a general block of information here though are some common chemicals that get used to purify water.

  • Chlorine is used as an oxidizing agent to cause iron to precipitate and be filtered.
  • Both Chlorine and Chloramine are used to kill bacteria, viruses and other organisms.
  • Iron, in the form of Ferric Sulfate and Ferric Chloride is used to flocculate sediment into large particles that can be mechanically filtered out.
  • Aluminum compounds such as Aluminum Chloro-hydrate, Aluminum Sulfate and Poly-Aluminum Chloride are also used as flocculants
  • Hydrochloric, Citric, and Sulfuric acids may be used to lower the pH of highly alkaline water
  • Sodium Hydroxide or (NaOH) may be used to Raise the pH of acidic water. Calcium Hydroxide, or Calcium Chloride may also be used
  • Ozone and Hydrogen may be used to kill bacteria
  • Sodium may be used in water softening where high-hardness calcium scale is problematic


Tommy V
Tommy V
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