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        1．用(yong)(yong)戶(hu)(hu)用(yong)(yong)水(shui)(shui)(shui)時(shi)經(jing)常會感(gan)到自來水(shui)(shui)(shui)發黃，尤其是在早晨剛開始用(yong)(yong)水(shui)(shui)(shui)時(shi)尤為(wei)明(ming)顯，這主(zhu)要是用(yong)(yong)戶(hu)(hu)戶(hu)(hu)內管道年久失修或使(shi)(shi)用(yong)(yong)了劣質的管材所致。 管道內壁(bi)未作內防腐處理，與(yu)水(shui)(shui)(shui)中(zhong)余氯接觸會銹蝕(shi)生(sheng)成(cheng)氯化物，一部(bu)分(fen)在管壁(bi)上形(xing)成(cheng)銹垢，一部(bu)分(fen)隨著水(shui)(shui)(shui)流(liu)帶出，用(yong)(yong)戶(hu)(hu)就會感(gan)覺到水(shui)(shui)(shui)質發黃現象(xiang)。用(yong)(yong)戶(hu)(hu)戶(hu)(hu)內管道使(shi)(shi)用(yong)(yong)已(yi)久，又經(jing)常性水(shui)(shui)(shui)質發黃，應考(kao)慮更新戶(hu)(hu)內管道。  
        2．用(yong)(yong)戶發(fa)(fa)現一幢樓(lou)或幾(ji)幢樓(lou)每(mei)戶都發(fa)(fa)生水(shui)(shui)(shui)(shui)質發(fa)(fa)黃，而且長時間不(bu)能排清(qing)，主要原(yuan)因是這部分用(yong)(yong)戶處在室外(wai)共(gong)用(yong)(yong)配(pei)水(shui)(shui)(shui)(shui)管(guan)(guan)的末稍(shao)部位（未環網）。如果為用(yong)(yong)戶配(pei)水(shui)(shui)(shui)(shui)的室外(wai)管(guan)(guan)道處在供水(shui)(shui)(shui)(shui)管(guan)(guan)道末稍(shao)，管(guan)(guan)網中的銹(xiu)蝕水(shui)(shui)(shui)(shui)質進入，靠用(yong)(yong)戶的用(yong)(yong)水(shui)(shui)(shui)(shui)量又不(bu)能排清(qing)，日積(ji)月累就形成了一段(duan)銹(xiu)水(shui)(shui)(shui)(shui)區，在此段(duan)管(guan)(guan)道上用(yong)(yong)水(shui)(shui)(shui)(shui)的用(yong)(yong)戶就會同時感到水(shui)(shui)(shui)(shui)質發(fa)(fa)黃，無法用(yong)(yong)水(shui)(shui)(shui)(shui)。出(chu)現這種(zhong)情況，用(yong)(yong)戶應及時與自(zi)來水(shui)(shui)(shui)(shui)公司聯系，采(cai)取相(xiang)應措施(shi)解決(jue)。