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Ditto,
Also remember that turbidity and solved metals (for instance iron) in the water to treat will impact the process (it is mentioned in the methodology by Lantagne linked above), therefore either requiring pretreatment (e.g. flocculation) or, in case that's not possible, to increase the chlorine quantities.
Furthermore, it is important mentioning that, as per the 2008 MSF VHF guidelines, the chlorinated solution should be prepared daily and then changed at the handwashing and footbaths stations at least twice a day or upon need; for footbaths, it is also advised to have an additional basin as to wash any dirt from the boots prior entering the foodbath.