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<p>Pour obtenir de l'eau potable, il faut &eacute;liminer de l'eau douce de nombreux polluants, c'est le <strong>traitement</strong> primaire (d&eacute;grillage, filtration...).</p> ]]></baseNameString></baseName>  </occurrence></topic>  <association>    <instanceOf>      <topicRef xlink:href="#broader-narrower"/>    </instanceOf>    <member>      <roleSpec>  <topicRef xlink:href="#narrower"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=207"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#broader"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=204"/>    </member>  </association></topicMap>