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# Some chlorine reacts with other organic matter and forms new chlorine compounds. This portion is called combined chlorine.
# Excess chlorine that is not consumed or combined remains in the water. This portion is called free residual chlorine (FRC). The FRC helps prevent recontamination of the treated water.
{{procontable | pro=
- Some NaDCC products claim that there is no bad odour or taste after use <br>
- Highly acceptable to users because of ease of use, chlorine taste and prestige <br>
| con=
- Distribution system of the products should be developed <br>
- Relatively high cost <br>
- Toxoplasma oocysts and cryptosporidium oocysts are highly resistant to chlorine disinfection <br>
- Most users cannot determine the dosing quantity themselves; proper use requires instructions from the manufacturer <br>
}}
==History and social context==
====Suppliers====
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.
==Cost==
