I  have  more  experience ...

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I  have  more  experience  with  water  monitoring  than water  treatment . But  what  I  notice  that  ion  exchenge  membranes  is  the  method  of  choice  in  a  such  cases. About  arsenic  ,  humm  it  dont  sounds very  good. One  should  consider other  choices  of   water  supply  if  available and compare  costs  and  practicity between  treat  this  water and to  find  other  water  source. Best  regards