謝謝邀請了，這個不是本專業(yè)問題，我的第一直覺這種問題應該邀

@默識先生

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我先貼一段wikipedia的小段子吧

Water passes through a bed of pure KDF or an Activated carbon/KDF mix. As the water makes contact with the KDF particles the Redox reaction takes place, removing such impurities as minerals, metals, dissolved oxygen and organic materials. The KDF itself creates a miniature electrolytic cell within the spaces between each particle, the zinc acting as the anode and the copper acting as the cathode within this cell, and the water and its impurities acting as the electrolyte through which the charge flows. When the contaminants and impurities found in water pass through this electrolytic cell, some substances, especially metals, react to the magnetic force exerted by the electrolytic cell and are attracted to the surface of the KDF particles, where they adhere. Other non-metal impurities react with the KDF and form zinc oxides, copper hydroxides, hydroxides, and sulfates in the water. These by-products remain within the drinking water, but are not dangerous[citation needed], also as part of this reaction, ozone is created and carried through into the drinking water, forming a hostile and desolate environment for algae, bacteria and any other array of micro-organism.

根據(jù)wikipedia說的，雖然慮水過后銅鋅的氧化物殘留在飲用水中，但是這些殘留并不對人體造成危害。不過請注意，這里是沒有citation的。也就是說這句話沒有權威方認證。

我在網(wǎng)上大概搜索了一下，也許是國家的關系，kdf filter的安全性在美國并沒有飽受爭議，唯一找到的對kdf提出疑問的是這個從

KDF Filters - ToxicWaterSolution.com

發(fā)出的預警：

KDF water filters contain copper and zinc. Acidic water may corrode the KDF in your shower filter or water filter and release copper and zinc into your water. Copper can be absorbed through your skin. Copper in the shower or bath steam can be aborbed through your lungs. Excesscopperand zinc can become toxic.

Do the Heavy Metal Toxicity Testing or the Comprehensive Urine Element Profilebefore you use a KDF Filter. If you have toxic levels of copper or zinc in your body you should not use the KDF filter.

簡單翻譯一下是說，如果要使用kdf filter，最好使用者先做一個重金屬毒性測試，如果你的體內有過高的銅和鋅，那么就不要使用kdf filter了，因為如果是酸性的未過濾水會把kdf filter的銅鋅融到水中，而過量的銅鋅會產生毒性。

所以問題的關鍵在于是不是過量。就算有銅鋅攝入人體，如果不過量，及時排除就相當于沒有危害。關于這個問題，我在一小時的搜索中沒有找到任何美國網(wǎng)站號稱kdf filter會產生過量的銅鋅。

一些賣kdf的廠家是這么說的：

http://www.triangularwave.com/f4.htm
KDF process media are completely safe. KDF media meet EPA and Food and Drug Administration standards for levels of zinc and copper in potable water, so the process is not toxic and does not cause any adverse side effects.

“KDF 截止符合環(huán)境局和FDA對銅鋅在飲用水中的含量標準，所以無害。”

雖然這個話是kdf廠家說的，理論上有viewpoint bias，但是這個話在美國是不能亂說的。我傾向于相信其真實性，畢竟沒有爭議這個事本身就說明一定的問題。

最后有一個youtube視頻對kdf filter發(fā)起了控訴。如果你們愿意看一下，地址在此：

http://www.youtube.com/watch?v=e1ZMJSSpnwA

對于不愿意看的，我來解釋一下核心意思： 雖然這個視頻是控訴kdf的，但是控訴的原因并不是因為銅鋅超標，也不是因為銅鋅的危害。而是kdf號稱能夠去除水中的氯，但是沒有去除一氯胺。老頭子深感自己被坑，所以發(fā)表聲明。

以上包含了我在一個小時的搜索內在英文網(wǎng)頁中能找到的所有對kdf filter的不利證據(jù)，我不想保證kdf是絕對安全，但是至少我從我的搜索