As mentioned in previous ...

As mentioned in previous replies the available chlorine reduces during storage. Unless you want to confirm the supply quality, I would much rather control the free or total chlorine in the final process steam and adjust the dosing rate to achieve the residual that you require in the actual process stream. I suggest you use a rough estimate of the initial sodium hypochlorite chlorine content (5% or 12-15% whatever the case), calculate a preliminary initial dose and adjust according to the free/total chlorine measured in the actual process stream which is the important control parameter?