個位友友有沒有好的方法或建議？
#衛生間#
謝謝邀請！
老房子及裝修中沒處理好的衛生間反味，是一個比較常見的問題，給人們的居家生活帶來不少煩惱，某種程度上，也影響了現代品質生活的質量。
常見的衛生間反味問題，可以通過下列一系列方法加以改造，改進，避免。
1.針對衛生間洗漱，洗手臺下水反味的改造，改進。
1）對衛生間下水管的改造。
如具有可行性及改造條件，可以將原不帶存水彎的下水管，通過增加存水彎，重鋪下水管，形成水封，從而阻隔反味。
不過這樣的改造動作比較大，需拆除原貼好磚的地面，墻面，原下水管，加存水彎改造，重新布設下水管后，還需要新澆地坪，做防水，進行蓄水試驗，再行貼磚，如果原地磚，墻磚無備貨，新購磚或難配成一致的，總體來說，操作比較麻煩。
2）更換帶存水彎的下水連接管。
如果原下水不具備改造的可行性，不具改造條件或拆除改造動作較大，你想省點事，減少成本，也可直接更換下水連接管，即從洗漱下水口至下水管口的一段連接管道，大多為塑料或不銹鋼軟管等。
購置現成的帶存水彎的下水管是比較簡單易行的方案，可以交由水電師傅安裝，動手能力比較強的你，自己也可以按照安裝說明安裝。
不用動大動作就可以消除衛生間洗漱部分反味的煩惱。
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2.針對衛生間地漏的改造。
如果衛生間未采用防臭地漏，反味則可能源自地漏。
1）更換防臭地漏。
具備地漏更換條件時可拆除原地漏改裝防臭地漏。
原來的非防臭地漏位置，可根據實際情況改裝防臭地漏；
新裝修的衛生間，記得要一步到位安裝防臭地漏，去除以后的地漏反味煩惱。
防臭地漏的更換安裝可以交由瓦工(泥工)師傅負責。
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2）加裝防臭地漏芯。
如果需要避免更換地漏對原衛生間地面造成的破壞和修復，可以采取不更換地漏，只加裝硅膠防臭地漏芯的方法。
這種硅膠材料地漏芯受到向下的水沖后自行張開，可以順利排水；正常狀態時則自行粘連閉合，阻擋自下而上的臭氣及小蟲蟲，從而實現防反味，防臭，防蟲。
硅膠地漏芯還可以根據地漏下水管道的不同深淺進行相應的裁剪。
無論是淋浴房的下水地漏，還是衛生間干區，濕區的排水地漏，都可以采用這種防臭地漏芯，安裝起來也簡單易行，看懂安裝說明，你自己也可以動手安裝。
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