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title: "Available Chlorine — TXDY Glossary"
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4.  Available Chlorine 

A 

# Available Chlorine

measurement 

The amount of active chlorine in a disinfectant that is available to kill microorganisms.

## Definition

Available chlorine is the measure of oxidising chlorine species (primarily hypochlorous acid and hypochlorite ion) in a disinfectant solution that can participate in antimicrobial action. It is usually expressed in parts per million (ppm) or as a percentage, and is the key metric used to compare chlorine-based disinfectants at their in-use dilution.

## Why it matters

Two products can contain very different total chlorine content yet deliver the same available chlorine once diluted. Specifying disinfection protocols by available chlorine (e.g., 1,000 ppm) ensures that outcomes are comparable regardless of the source chemistry.

## Practical applications

Referenced in infection control guidelines, food safety standards and manufacturer dilution charts to specify the strength of chlorine solutions required for different cleaning and disinfection tasks.

## Related terms

[ATP Swab](/knowledge-center/glossary/atp-swab)[ATP Testing](/knowledge-center/glossary/atp-testing)[Dilution Ratio](/knowledge-center/glossary/dilution-ratio)[Free Available Chlorine (FAC)](/knowledge-center/glossary/free-available-chlorine)[Luminometer](/knowledge-center/glossary/luminometer)[PPM (Parts Per Million)](/knowledge-center/glossary/ppm)

## Referenced in

-   [The Technical Guide to NaDCC Disinfectant Tablets: Chemistry, Dilution, and Operational Implementation](/knowledge-center/articles/nadcc-disinfectant-tablets-technical-guide)
-   [Disinfectant Tablet Dilution: How to Calculate the Right Concentration](/knowledge-center/articles/disinfectant-tablet-dilution-how-to-calculate-the-right-concentration)
-   [Why Hospitals Are Switching to NaDCC Disinfectant Tablets](/knowledge-center/articles/why-hospitals-are-switching-to-nadcc-disinfectant-tablets)
-   [NaDCC vs Sodium Hypochlorite](/knowledge-center/articles/nadcc-vs-sodium-hypochlorite)

## Need help applying this?

Our team can help design the right disinfection protocol for your operation.

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