CHLORINE, 5mg, NaDCC 8.5mg, for disinfection 1l water, tab


Valid Article

Former Code(s): CWATYCHN5T-
Hazardous materials and products (identified by their 4-digit transport UN-number) must be transported under certain conditions as specified in the MSDS sheet (Material Safety Data Sheet).
The product is part of at least one Kit. A kit is a collection of products (medical and/or logistic) that are needed for a certain intervention in emergency. The choice and quantity of the articles reflects the MSF protocols for this specific situation. The use of Kits allows to start an intervention without a detailed evaluation.
OC subscriptions: included in supply or field order tools (e.g. UniField)
SC subscriptions: included in supply or field tools
OC validations: approved for procurement and use by an OC for international or local orders specifying context and activity in Medical Standard Lists (MSL)

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Disinfectant used for treating small quantities of water with a turbidity of < 5 NTU.

NaDCC exists in 2 different chemical forms: anhydrous and dihydrate.


  • CWATDISINTF: effervescent tablet containing 8.5 mg NaDCC (either anhydrous or dihydrate). One tablet releases 5 mg of available chlorine when it is dissolved in 1 litre of water.
  • CWATDISINTT: effervescent tablet containing 17 mg NaDCC (either anhydrous or dihydrate). One tablet releases 10 mg of available chlorine when it is dissolved in 5 litres of water.

The tablets have the following properties depending on their form:

CAS number2893-78-951580-86-0
Chemical formulaNaC3N3O3Cl2NaC3N3O3Cl2·2H2O
Available chlorine> 62.0%55.0% - 57.0%
Solubility in water24 g/100 g28 g/100 g

Packaging & Labelling


Transport Dangerous Goods

NaDCC, both in dihydrate and in anhydrous form, is regulated for air transport, with the following conditions:

  • UN 3077
  • Requires specific packaging and labelling until final destination

Ask for an MSDS (Material Safety Data Sheet) from your supplier; this should contain all necessary information.

Instructions for use

Strength of solutions is expressed in terms of available chlorine content (either in g or mg per litre, in parts per million (ppm), or as a percentage).

=> 5 mg/litre = 5 ppm = 0.0005%

This strength is intended only for disinfecting small quantities of drinking water.


  • One 5 mg tablet in 1 litre of clean water. Allow to react for at least 30 minutes before drinking.
  • One 10 mg tablet in 5 litre of clean water. Allow to react for at least 30 minutes before drinking.

The above dosing is recommended by the manufacturer. Actual chlorine demand might differ from water to water, especially when chlorinating surface water. It is highly recommended to carry out a jar test to define appropriate dosing.

Turbid water should first be brought to a turbidity of <5 NTU before being treated with chlorine. To reduce turbidity, turbid water should be filtered, clarified or allowed to settle.

For large-scale water treatment, use the 1 g tablets (see "Related Articles" below) or NaDCC or calcium hypochlorite granules (HTH).

See "Public Health Engineering in Precarious Situations", MSF, 2nd edition 2010:

  • T.B. 2.19 Chlorine-generating products
  • T.B. 2.20 Preparation and use of chlorine solutions for disinfection
  • T.B. 2.21 Batch chlorination of drinking water


Use a pool-tester to check the presence of residual chlorine. See "Public Health Engineering in Precarious Situations", MSF, 2nd edition, 2010:

  • T.B. 2.22 Monitoring chlorination

Precautions for Use

  • NaDCC in blister tablets is used only to prepare drinking water and not as a disinfectant. Larger tablets from 1 gram could be used as disinfectant.
  • Prepare solutions in non-metal containers, immediately before use.
  • Avoid inhaling vapour and dust when handling chlorine.
  • Do not expose to a naked flame, and do not incinerate.
  • Never mix NaDCC solution with calcium hypochlorite powder: the mixture undergoes a chemical reaction and may explode!
  • Do not mix with detergents since toxic chlorine gas could be released.
  • Do not mix with acid solutions since this releases toxic chlorine gas.
  • Do not mix or store NaDCC with fuel.


Store in a dry and well-ventilated place, out of direct sun light.

Do not store in the same place as fuel and other petroleum products.

Shelf-life in good storage conditions: 5 years for blister packs.

Waste management

Contact your WHS technical referent for disposal of expired or damaged batches of NaDCC.

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Image Image
H302Harmful if swallowed
H319Causes serious eye irritation
H335May cause respiratory irritation
H410Very toxic to aquatic life with long lasting effects
EUH031Contact with acids liberates toxic gas.
P402 + P404Store in a dry place. Store in a closed container.
P233Keep container tightly closed.
P280Wear protective gloves/protective clothing/eye protection/face protection
P301 + P310IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P501Dispose of contents/container to location in accordance with local and regional/ national/ international regulations
P305 + P351 + P313IF IN EYES: rinse continuously with water for several minutes. Get medical advice/attention