UNE-EN 13623:2021

This document specifies a test method and the minimum requirements for bactericidal activity of

chemical disinfectant products intended to be used for treatment in aqueous systems against Legionella

pneumophila that form a homogeneous, physically stable preparation when diluted with buffered

ferrous hard water or hard water. Whenever Legionella pneumophila poses a risk to human health, this

method is suitable for water used in cooling towers and water for general purposes, like spas, pools,

showers and other uses. The method is not suitable for electro-chemical disinfection.

The European Standard applies to products used as a single application shock treatment in order to kill

Legionella pneumophila. It is not suitable for the evaluation of those products that are dosed

continuously in to water systems to control the growth of Legionella pneumophila.

NOTE 1 The method described is intended to determine the activity of commercial formulations or active

substances under the conditions in which they are used.

NOTE 2 This method corresponds to a phase 2 step 1 test.

NOTE 3 This method does not take into account the fact that Legionella pneumophila is often found in cells of

amoebae and/or biofilms and that thereby a product s activity against the bacteria may be reduced.

EN 14885 specifies in detail the relationship of the various tests to one another and to "use

recommendation".