Difference between available chlorine and residual chlorine
Answers
Free chlorine a component of total residual chlorine and portion of dissolved chlorine gas that is not bonded to any reactants in water.
Other portion is called as combined chlorine which is bonded with chemicals typically nitrates in water.
These terms are used by water treatment experts examining safety of water.
Chlorine is introduced to water supplies because of its capacity to alter pollutants and kill toxic bacteria and pathogens.
Amount of contaminants in water if they are metals/organic substances confirms the chlorine demand of the water.
This amount of free chlorine that's consumed by reactions in water.
This reacted chlorine changes to combined chlorine while excess remains free chlorine.
In perfectly clean water, chlorine demand is zero.