Depending on your setting, ...

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Depending on your setting, naturally occurring or non-point sources.  I would suggest alum, this will drop out or precipitate most of the TDS and may be any easy fix.  Though, pH/Eh would be certainly relevant.  R/O would work but is prohibitive in cost.   Looking at the water's  source would be highly advisable.  I'm not sold on the biological approach but there are many methods once again depening on your setting, usage, flow rate and other variables.

check out http://www.sswm.info/content/arsenic-removal-technologies   you also might want to check out specific conductance and dissolved oxygen levels.  Is the source water, surface groundwater, anaerobic or not.

 

good luck

 

bil