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How Does a Dechlorinator Work?

Published in Water Treatment 2 mins read

A dechlorinator works by chemically neutralizing chlorine and chloramine in water, rendering them harmless. Most dechlorinators utilize sodium thiosulfate as the active ingredient.

Here's a breakdown of the process:

  • Active Ingredient: The primary component in most dechlorinators is sodium thiosulfate (Na₂S₂O₃). This substance appears as a white powder or crystal similar to rock salt.

  • Chemical Reaction: Sodium thiosulfate reacts with chlorine (Cl₂) and chloramine (NH₂Cl) present in the water through a redox (reduction-oxidation) reaction. This reaction transforms the chlorine and chloramine into less harmful substances.

  • Neutralization Process: The chlorine or chloramine molecules are broken down and converted into chloride ions (Cl⁻), which are far less toxic to aquatic life and humans. The sodium thiosulfate itself is oxidized in the process.

  • Harmless Byproducts: The reaction results in the creation of substances that are generally considered safe for aquatic environments and drinking water within established safety guidelines.

  • Forms of Dechlorinators: Dechlorinators are commonly available in liquid or powder form. The powder form is typically dissolved in water before use for easier application and accurate dosing.

In summary, dechlorinators use sodium thiosulfate to chemically react with chlorine and chloramine, breaking them down into harmless byproducts and effectively neutralizing their harmful effects in water.