The chlorine level is ...

The chlorine level is exceptionally high and way beyond what we would recommend as a final residual. The concentrations will cause significant taste/odour issues in the receiving environment, in addition to corrosion of the system after the dosing point. Chlorine gas is typically used for potable water treatment due to the high quality of the water and relative sensitivity of chlorine gas dosing systems. When targeting wastewater, where you have solid particles, organics and the potential for biofilm, you need to make sure your setup allows for reduction in solids (which shield bacteria), elimination of biofilm (eg routine shock dosing of biocide) and then final chlorine disinfection using sodium hypochlorite (or similar). If your wastewater is variable, chlorine gas won't be sensitive enough. You need a system with downstream residual dosing monitoring and feedback to a dosing pump. Hypo is perfect for this, but only as one component of a multi-stage management routine.