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CHLORINE, 20mg, NaDCC 33mg, for disinfection 5l water, tab

https://medicalguidelines.msf.org/en/node/996
https://unicat.msf.org/cat/product/11384
STD CWATDISINT2

Valid Article

Former Code(s): CWATZTF0632 DDISZFR0022 CWATYCHN33G DDISNADC002T B SDISNADC002T
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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CHLORINE, 20mg, NaDCC 33mg, for disinfection 5l water, tab

Definition

Tablets of disinfectant (NaDCC Chlorine) used for treating small quantities of water with a turbidity of < 5 NTU.

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

Often used for household water treatment.

Synonym

Sodium dichloro-s-triazinetrione or sodium troclosene.

Specifications

Water purification tablets containing 33 mg sodium dichloroisocyanurate (NaDCC) which releases 20 mg available chlorine. Around 60% of active chlorine.

Part of KWATKHHWT1- KIT, household WATER TREATMENT, 1000 families, 2 months.

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).

=> 20 mg/litre = 20 ppm = 0.002%

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

Dissolve:

  • One 20 mg tablet in 4 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, 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
  • T.B. 2.22 Monitoring chlorination

Read the household water treatment hand book (MSF2015) T.B. (Technical Briefs) chapters 1 and 2 before starting.

T.B. chapter 1 describes the pre-test to be performed before the distribution as it will indicate whether the full treatment (pre-treatment + disinfection) is required and if both chemical consumables must be distributed.

To ensure appropriation of the kit and use of treatment it is essential to combine distribution and demonstration and use sensitisation tools. Follow the distribution procedure described in T.B. chapter 4.

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

Remark

Use a pool-tester to check the presence of free 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.

Storage

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.
P271Use only outdoors or in a well-ventilated area.
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