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[[Image:safe_water_systems_icon.png|right|80px]]
[[Image:NaDCC.jpg|thumb|right|200px|NaDCC tablet]]
NaDCC, also known as sodium dichloroisocyanurate Sodium Dichloroisocyanurate or sodium trocloseneTroclosene Sodium, is one form of chlorine used for disinfection. It is often used to treat water in emergencies, and is now widely available for household water treatment.
NaDCC tablets are available with different chlorine content (e.g. 3.5 mg to 10 g) to treat from 1 to 3000 litres at a time. They are usually effervescent (meaning that escaping carbondioxide carbon dioxide gas causes the tablets to dissolve quickly, with a 'fizz'), allowing the tablet to dissolve in less than 1 minute.
When added to water, NaDCC releases hydrochloric acid which reacts through oxidization with microorganisms and kills them.
Most users cannot determine the dosing quantity themselves; proper use requires simple instructions from the manufacturer. Users often use less than the recommended dose to save money.
Metering pumps as [[Dosatron]] can be used to perform proportional dosing
====Manufacturing====
====Suppliers====
Hydrachem Ltd. manufactured Oasis [http://www.oasiswaterpurification.com/ Water Purification tablets ] in the United Kingdom. Hydrachem are the largest suppliers to UNICEF.<ref name=unicef14>[[#unicef14|UNICEF Supply Report (2014)]]</ref>
Medentech Ltd. manufactures Aquatabs for water disinfection, hospital surface infection control and general environmental disinfection. In Tanzania, PSI imported a single sized 20 litre-tablet that are packed locally in boxes of 36 10 tablet-strips.
===Manuals, videos, and links===
* [http://fieldresearch.msf.org/msf/bitstream/10144/618835/1/FRC+Op+Guidance+Briefing+Note+%28Nov+2016%29.pdf Operational Guidance Briefing Note: Evidence-based Free Residual Chlorine (FRC) Targets]
* [http://www.hydrachem.co.uk Hydrachem Ltd.]
* [http://www.cawst.org CAWST (Centre for Affordable Water and Sanitation Technology)]