WEFTEC, Muswaangano wa Water Environment Federation's Annual Technical Exhibition and Conference, muswaangano mupati kwiinda yoonse muNorth America mpawo upa zyuulu zyabasyaazibwene mububotu bwamaanzi kuzwa munyika yoonse lwiiyo lubotu lwabubotu bwamaanzi luliwo mazubaano. Alimwi kazibinkene mbuli chitondeezyo chipati chabubotu bwamaanzi munyika yoonse, busena bupati bwakutondezya bubotu bwamaanzi bwa WEFTEC bupa nzila iitakonzyi kweezyanisyigwa yakubelesya minchina iisumpukide loko.
Chiindi chakutumizya: Aug-14-2013
