prEN 15072

Chemicals used for treatment of swimming pool water - Sodium dichloroisocyanurate, anhydrous

This document is applicable to sodium dichloroisocyanurate, anhydrous used directly or used to prepare commercial formulations for disinfecting swimming pool water. It describes the characteristics of sodium dichloroisocyanurate, anhydrous and specifies the requirements and the corresponding test methods for sodium dichloroisocyanurate, anhydrous. It gives information on its use for treating swimming pool water and determines the rules relating to safe handling and use (see Annex B).

Produkte zur Aufbereitung von Schwimm- und Badebeckenwasser - Natriumdichlorisocyanurat, wasserfrei

Dieses Dokument gilt für Natriumdichlorisocyanurat, wasserfrei, das direkt zur Desinfektion von Schwimm  und Badebeckenwasser oder zum Herstellen handelsüblicher Zubereitungen für diesen Zweck verwendet wird. Es beschreibt die Eigenschaften von Natriumdichlorisocyanurat, wasserfrei und legt die Anforderungen sowie die entsprechenden Prüfverfahren für Natriumdichlorisocyanurat, wasserfrei fest. Es enthält Angaben zur Anwendung von Natriumdichlorisocyanurat, wasserfrei in der Aufbereitung von Schwimm  und Badebeckenwasser und legt Regeln für die sichere Handhabung und Verwendung fest (siehe Anhang B).

Produits chimiques utilisés pour le traitement de l'eau des piscines - Dichloroisocyanurate de sodium, anhydre

Le présent document est applicable au dichloroisocyanurate de sodium, anhydre utilisé directement ou pour préparer des formulations commerciales pour désinfecter l’eau des piscines. Il décrit les caractéristiques du dichloroisocyanurate de sodium, anhydre et spécifie les exigences et les méthodes d’essai correspondant à ce produit. Elle donne des informations pour son utilisation dans le traitement de l’eau des piscines. Elle fixe également les règles relatives à la sécurité d’emploi et de manipulation (voir Annexe B).

Kemikalije, ki se uporabljajo za pripravo bazenske vode - Natrijev diklorizocianurat, brez vode

General Information

• Status: Not Published
• Publication Date: 27-Apr-2022
• Withdrawal Date: 27-Oct-2022
• ICS: 71.100.80 - Chemicals for purification of water
• Technical Committee: CEN/TC 164 - Water supply
• Drafting Committee: CEN/TC 164/WG 9 - Drinking water treatment
• Current Stage: 4098 - Decision to abandon - Enquiry
• Start Date: 30-Sep-2022
• Completion Date: 14-Apr-2025
• Ref Project: oSIST prEN 15072:2020 - Chemicals used for treatment of swimming pool water - Sodium dichloroisocyanurate, anhydrous

Relations

• Revises: EN 15072:2013 - Chemicals used for treatment of swimming pool water - Sodium dichloroisocyanurate, anhydrous
• Effective Date: 19-Jan-2023

Overview

The prEN 15072 standard published by CEN provides comprehensive specifications for sodium dichloroisocyanurate, anhydrous, a key chemical used in the treatment and disinfection of swimming pool water. This standard governs the chemical’s characteristics, purity requirements, test methods, and safety protocols. It aims to ensure the safe and effective use of sodium dichloroisocyanurate in aquatic recreational environments, safeguarding water quality while providing guidance on handling, transport, and storage.

Key Topics

• Chemical Identification and Properties
  Sodium dichloroisocyanurate, anhydrous, with the CAS number 2893-78-9, is a white granular solid with a distinctive chlorinous odor. It is a strong oxidizer with a molecular mass of 219.98 and empirical formula C3N3O3Cl2Na. This substance is highly soluble in water (250 g/l at 25 °C) and functions as a disinfectant by releasing free chlorine upon hydrolysis.

• Purity and Composition Requirements
  The product must contain at least 62% available chlorine, with strict limits on water content (less than 3%) and sodium chloride impurity (less than 0.05%). Toxic substances, including arsenic, cadmium, chromium, mercury, nickel, lead, antimony, and selenium, are tightly regulated within specific maximum mg/kg concentrations to ensure safety.

• Safe Handling and Use
  The standard emphasizes safety measures, warning against mixing this chemical with other inorganic chlorines, such as sodium hypochlorite or calcium hypochlorite. Detailed first aid instructions and spillage management protocols are provided. Sodium dichloroisocyanurate is classified as an oxidizer and poses hazards including fire risk enhancement.

• Packaging, Labelling, and Transportation
  Sodium dichloroisocyanurate must be delivered in clean, dedicated fiber or polyethylene containers. It is labelled with hazard statements including oxidizer warnings, toxicity if ingested, and aquatic toxicity. Transport classifications align with UN Number 2465 regulations, including ADR, RID, IMDG, and IATA standards for class 5.1 oxidizers.

• Storage Recommendations
  The substance requires storage in a cool, dry place, away from incompatible materials such as water, strong acids, organic solvents, peroxides, oils, ammonium salts, and basic products. It is stable for at least three years under proper storage conditions.

Applications

Sodium dichloroisocyanurate, anhydrous is predominantly used as a biocide and disinfectant for swimming pool water treatment. By slowly releasing chlorine, it controls microbial growth and maintains hygienic water quality. Its granular and tablet forms allow dosing flexibility, either directly or via dissolution devices. Beyond disinfection, the chemical oxidizes iron, manganese, and ammonium compounds and helps remove odours and organic coloration from pool water.

Pool operators and water treatment facilities use this chemical to maintain safe free chlorine levels, typically dosing about 3.97 grams per cubic meter of water to achieve 2.5 mg/l free chlorine. However, due to the accumulation of sodium isocyanurate as a stabilizer by-product, regular dilution with fresh water is necessary to prevent diminished disinfectant efficacy.

Related Standards

• EN 12931: Specifies methods for sodium dichloroisocyanurate used in emergency water treatment for human consumption.
• Directive 1998/8/EC (EU Biocidal Products Directive): Governs biocidal products including pool disinfectants, ensuring compliance with safety, environmental, and health requirements.
• UN and ADR Regulations: Define transportation, packing, and hazard classification of chemicals like sodium dichloroisocyanurate under international and European transport rules.

---

Keywords: sodium dichloroisocyanurate, swimming pool water treatment, pool disinfectant, chlorine disinfection, biocide chemical standards, CEN prEN 15072, pool water safety, chemical handling, water purification chemicals, storage and transport of oxidizers

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2020
Kemikalije, ki se uporabljajo za pripravo bazenske vode - Natrijev
diklorizocianurat, brez vode
Chemicals used for treatment of swimming pool water - Sodium dichloroisocyanurate,
anhydrous
Produkte zur Aufbereitung von Schwimm- und Badebeckenwasser -
Natriumdichlorisocyanurat, wasserfrei
Produits chimiques utilisés pour le traitement de l'eau des piscines -
Dichloroisocyanurate de sodium, anhydre
Ta slovenski standard je istoveten z: prEN 15072
ICS:
13.060.25 Voda za industrijsko uporabo Water for industrial use
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2020
ICS 71.100.80 Will supersede EN 15072:2013
English Version
Chemicals used for treatment of swimming pool water -
Sodium dichloroisocyanurate, anhydrous
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Schwimm- und
des piscines - Dichloroisocyanurate de sodium, Badebeckenwasser - Natriumdichlorisocyanurat,
anhydre wasserfrei
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 164.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15072:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
3.1 Identification . 5
3.2 Commercial form . 6
3.3 Physical properties . 6
3.4 Chemical properties . 7
4.1 General. 7
4.2 Composition of commercial product . 7
4.3 Impurities and main by-products . 7
4.4 Toxic substances . 7
6.1 Means of delivery . 8
6.2 Labelling . 8
6.3 Transportation regulations and labelling . 10
6.4 Marking . 10
6.5 Storage . 10
Annex A (informative) General information on sodium dichloroisocyanurate, anhydrous . 12
Annex B (normative) General rules relating to safety . 14
Bibliography . 15

European foreword
This document (prEN 15072:2020) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15072:2013.
Introduction
In respect of potential adverse effects on the quality of water intended for swimming pools caused by
the product covered by this document, the following statements apply:
a) this document provides no information as to whether the product may be used without restriction
in any of the Member States of the EU or EFTA;
b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national
regulations concerning the use and/or the characteristics of this product remain in force.
NOTE 1 Conformity with this document does not confer or imply acceptance or approval of the products in any
of the Member States of the EU or EFTA. The use of the products covered by this document is subject to regulation
or control by National Authorities.
NOTE 2 This product is a biocide and needs to comply with the relevant legislation in force. In the European
Union, at the time of publication, this legislation is Directive 1998/8/EC [1].
1 Scope
This document is applicable to sodium dichloroisocyanurate, anhydrous used directly or used to
prepare commercial formulations for disinfecting swimming pool water. It describes the characteristics
of sodium dichloroisocyanurate, anhydrous and specifies the requirements and the corresponding test
methods for sodium dichloroisocyanurate, anhydrous. It gives information on its use for treating
swimming pool water and determines the rules relating to safe handling and use (see Annex B).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 12931, Chemicals used for treatment of water intended for human consumption - Chemicals for
emergency use - Sodium dichloroisocyanurate, anhydrous
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Description
4.1 Identification
4.1.1 Chemical name
1-sodium - 3,5-dichloro - 1,3,5-triazine - 2,4,6-trione.
4.1.2 Synonym or common name
Sodium dichloroisocyanurate.
4.1.3 Relative molecular mass
219,98.
4.1.4 Empirical formula
C N O Cl Na.
3 3 3 2
4.1.5 Chemical formula
4.1.6 CAS Registry Number
2893-78-9.
4.1.7 EINECS reference
2-207-67-7.
4.2 Commercial form
The product is available in various granular forms.
4.3 Physical properties
4.3.1 Appearance and odour
The product is a white granular solid with chlorinous odour.
4.3.2 Density
The bulk density is approximately 0,9 g/cm .
4.3.3 Solubility in water
The solubility in water is 250 g/l at 25 °C.
4.3.4 Vapour pressure
Not applicable.
4.3.5 Boiling point at 100 kPa
Not applicable, the product decomposes before fusion.
4.3.6 Melting point
Not applicable.
4.3.7 Specific heat
(1 090 ± 40) J/kg.K at 20 °C.
Chemical Abstracts Service Registry Number.
European Inventory of Existing Commercial Chemical Substances.
100 kPa = 1 bar.
...