Is your well classified as ...

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Is your well classified as GUDI (Groundwater Under The Influence of Surface Water)?  If so, have you completed a cost comparison on the extremely high effort of cleaning that you are doing and compared that to moving your well where the surface water is not influencing the groundwater?  I have no idea of your situation or where you're located or if you've done this already or not or on a tight budget but the bcalculation without maybe take 2 hours. GUDI water is the worst and when we come across it we generally end up relocating the well and removing the problem altogether. 

Another problem you will undoubtedly be facing is high DBPs (disinfectant by-products) such as THMs and HAAs in the treated water due to the high amount of chlorine you are adding in front of the treatment process. As long as there is at minimum 0.1 mg/L of residual Cl in the source water...You shouldn't have any troubles in killing the Cholera. 

 

Kurt