我都等到3-8，大概需要10秒-20秒。。
擦，还有这个操作，明天开始先放水3-8秒
啊这，是有什么讲究吗
我都是先把杯子对准再开RO
好问题，我的有机化学已经全都还给老师了……
直觉告诉我这个东西和水应该没什么反应，但是我的化学直觉已经快退化没了…还是等一个专业人士
记的泥潭之前有人说RO 系统刚开始几秒的水是脏的
but I can tell you that my tankless under sink RO does indeed have high TDS when first turned on. It does drop but takes about 45-60 seconds
https://old.reddit.com/r/WaterTreatment/comments/14vu5y4/tankless_ro_questions_and_initial_tds/
Tds creep comes from the equalization of tds across the membrane when the system is not making water. Every time the RO starts you will get a high tds water until that gets flush out. So on a tankless system every time you open the faucet the first bit of water is going to have higher tds and it’s the same with a tank systems but it doesn’t necessarily turn on every time you use water and it runs for a longer period of time bringing the average tds down in addition it mixes with the volume in the tank. In sort if you use frequent small volumes there will be more tds creep that using larger volumes less frequently.
https://old.reddit.com/r/WaterTreatment/comments/17jx7zq/good_idea_to_add_tank_to_tankless_ro/
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那感觉3-8秒不够啊，先要开水一分钟。。。
But I don’t wait 1 minute before getting water to drink every time, I want to test the water under my normal drinking habits scenario
what’s the point of getting an RO machine if I have to wait 1 minute to drink water every time I’m thirsty…
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我记得G3P800是每2hr就会自己flush一次
也许…就没那么糟？
P600应该也有这个功能
Yeah my G3P600 flushes very frequently, so I don’t think it will be too bad.
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Thanks for the test, follow for the result
不用外置容器的 flush 聊胜于无，原因见
真实结果需要开个几十秒等 TDS 稳定以后才算数，并且得用自己的 TDS 笔不能看龙头数显，因为厂家为了掩饰出水问题会在刚开龙头那会做假。。。
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EPA给的致癌guideline是 2*10^-3 per mg/kg—day，等于70kg的人每天要摄入0.14mg
按照第一个测试30ppb （在水里ppb=micro gram/litter），70kg一天需要喝28升的水
当然它过滤完增加了dichoromethane很可能在制造工艺上有问题，毕竟是工业溶剂自来水里也不应该有。EPA致癌guideline也应该相对高一点，给小孩子喝可能更担心。支持猴哥测试
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好吧,我又上amazon买了个11刀的tds meter…
另一个担心的点是这只是oral exposure的dose，既然dichoromethane易挥发，那不可避免会有inhalation，而且水里检测出来的大概率是underestimate？
纯的肯定易挥发有吸入风险，融在水里的30ppb挥发不了什么的，既然是喝水，考虑oral摄入就行了
EPA也给了inhale的guideline
我g3p800是只要用了之后不久就会short flush，换filter后手动重置会long flush
看到猴哥送测的是under sink的。有没有坛友用的是coutertop的（上面这两个型号或类似的k19系列）？如果需求大，我愿意去lab送测一下。然后，我准备换一家与视频里不一样的lab来cross-check一下：
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这个$149就能测，我也买个测一下
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我用的m5
Oh crappp I wasted $80…. Nice catch