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Chlorination planning check

Work out the theoretical mass of available chlorine represented by a competent person's target increase. This page does not convert that figure into a chemical product quantity or prescribe a treatment method.

Based on HSG274 Part 2. Your site's risk assessment decides what applies.

Safety boundary

Chlorination is hazardous. A competent person must provide the COSHH assessment, site-specific method statement, target residual, contact time, chemical selection, isolation, testing, neutralisation, discharge and handback controls. Never mix chlorine with acids or other chemicals. The figure below ignores water chlorine demand, pH, temperature and product strength, so it is not a product dose.

Use a measured or defensible design volume, in litres.
litres
Enter the measured free-chlorine result, not total chlorine.
mg/l free chlorine
This target must come from the competent person's method statement.
mg/l free chlorine

Source: HSG274 Part 2 (2024), “Cleaning and disinfection”, p.87.

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"Chlorination planning check." Legionella.io. https://legionella.io/tools/chlorination-dose-calculator/

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