不是每种纯净水都是好的，也不是每种贵的矿泉水都物有所值。来看看国外对20个品牌的矿泉水做的PH测试，对以后在外选购放心的矿泉水非常受用。
https://www.※※※※※※※.com/watch?v=AacP_xH2aQI
不能翻墙的可以看看这篇文章：http://www_alkalinewaterplus_com/analyzing-and-comparing-bottled-water

国外牛人对Berkey filter的极端测试，测试中用到了河水、雨水、游泳池水等等
地址在这里，可以翻墙的坛友可以看看https://www.※※※※※※※.com/watch?v=xC9iN_Kyico 本帖最后由 060836 于 2014-5-17 00:11 编辑

退休了的Santivia水壶和Berkey

隐形牙套，戴了半年多都没有同事发现

抽空翻译了下，有什么不对还望各位指正。

反渗透、蒸馏和使用Berkey滤芯三种方法过滤的水，哪个最为饮用水是最健康的？

当论及水对健康的影响时，绝大多数的健康专家根据最新的研究成果都不再推荐长期饮用反渗透和蒸馏的水，因为这些方法去除了水中对人体有益的所有矿物质，使得水变成酸性“低渗透压”溶液。化学家会告诉你任何时候当“低渗”（无矿物质）的溶液接触到“高渗透压”（含矿物质的）溶液时，在高渗透压溶液中的矿物质会向低渗透压的溶液转移直到重新平衡。简而言之，当人们喝“低渗透压”的水时，在血液和淋巴系统中的矿物质会向喝入体内的使用反渗透过滤或蒸馏的水中迁徙，接着这些矿物质将随着尿液被排出体外。

为了重新产生矿物质，血液和淋巴系统于是开始从人体其他组织中（例如骨骼和器官）汲取矿物质，当饮用“低渗透压”无矿物质的水时这一过程就会周而复始不断进行。几项研究表明长期饮用“低渗透压”水的人们往往更容易出现退化性疾病，例如骨质疏松症。

Berkey系统不会去除水中的有益矿物质，但它们的确会提取出有害的重金属，例如铅、汞以及其它矿物质沉积物如氧化铁。正因为此，TDS读数一般而言不会出现大的变化除非源水中有非常多的重金属或矿物质沉积物。

本帖最后由 060836 于 2014-5-15 11:27 编辑

很多朋友关注反渗透膜的机子，这里正好有一片关于Berkey,RO,distillation的对比文章，文章来自Berkey 官网，至于真实性如何大家就仁者见仁智者见智，权当饭后一读，以下是链接http://www_berkeywater_com/FAQs/10g_RO_Dist.html.
回去有时间会翻译下。

Reverse Osmosis and Distillation FAQ'S

Which of the three methods of water filtration, Reverse Osmosis, Distillation or Berkey® Purification is the healthiest for drinking purposes?
With respect to the healthfulness of the water, most health experts, that are up to date on current research, are no longer recommending drinking RO or distilled water on a long-term basis because these methods strip out all of the beneficial minerals from the water making the water an acidic "hypotonic" solution. A chemist will tell you that any time a hypotonic (de-mineralized) solution comes into contact with a "Hypertonic" (Mineralized) solution, the minerals within the hypertonic solution will transfer out of hypertonic solution and into the hypotonic solution until equilibrium is achieved. What this means is simply that when one drinks hypotonic water, the minerals in the blood and lymphatic system, which are hypertonic, transfer into the hypotonic RO or Distilled water that is consumed and the minerals are flushed out of the body upon urination.

In an effort to re-mineralize, the blood and lymphatic systems then begin to scavenge for minerals from other parts of the body, such as bones and other organs, and this process repeats itself every time de-mineralized hypotonic water is re-consumed. Several studies suggest that people who drink de-mineralized water (hypotonic) over a long period of time tend to be more prone to degenerative diseases such as osteoporosis.

Berkey® Purification systems do not remove the beneficial minerals from the water but they do extract harmful heavy metals such as lead and mercury as well as sedimentary minerals such as iron oxide. Therefore, the TDS reading will not typically change much unless there are a lot of heavy metals or sedimentary minerals within the source water.

Is there a way to verify for myself the effects of drinking de-mineralized hypotonic water?
Yes, you can check this out for yourself during a short fast. First check the TDS reading on your RO or distilled water, which should be around 1-3ppm. Then after drinking that water for several days check the TDS reading of your urine. Remember, the TDS only measures minerals not chemicals so any minerals that the TDS meter reads are minerals that are being leached or flushed out from your body.

What is the pathological removal capability of an RO system?
With respect to Pathogenic Bacterial removal, Reverse Osmosis does not remove Pathogenic bacteria and that is why it is often necessary to add an additional UV light to the system. However, the UV sometimes does not kill all the bacteria because any turbidity in the water can create shaded spots preventing some bacteria from being exposed. Typically, the UV is installed before the bladder tank, however it is in the bladder tank that bacteria usually colonize. Therefore, if the bladder tank is not sterilized on a regular basis, it becomes a source for bacteriological contamination that is never exposed to UV. Additionally, the carcasses of the dead bacteria remain within the drinking water with an RO system whereas they are removed by the Black Berkey™ purification elements.

Which type of water will have the best taste?
With respect to taste, distilled water will taste flat unless you shake it up rigorously because the distillation process strips the oxygen from the water. The taste of RO water is typically very good. The taste of Berkey® purified water is typically very good unless there is an excessive amount of ionized minerals in the source water. Even in such circumstances the improvement in the taste of the water is usually remarkable.

With respect to maintenance, how do the three types of systems compare?
All Berkey® systems are easy to disassemble and clean. Typically the lower chamber should be washed in ordinary dishwater once per month. The elements need to be cleaned after 6-12 months of use.

Distillation systems need to be soaked and cleaned with vinegar solution to remove the scale, typically after each gallon or two.

Reverse Osmosis systems can have up to four filter elements, with each needing to be changed at differing intervals from four months up to two years. This requires that the water pressure be shut off and part or all of the system to be disassembled for maintenance. Additionally, the bladder tank should be washed with a chlorine solution at six-month intervals to kill any colonizing bacteria.

How do the three types of systems compare with respect to cost?
With respect to upfront cost, RO systems typically are the most expensive due to the cost of the system and the additional expense to have the system plumbed in. Next in cost would be a distillation unit. A Berkey® system will typically be the least expensive of the three.

With respect to cost per gallon of water, calculated upon the cost per gallon for replacement filters and energy costs, Distillation systems and RO systems properly maintained typically cost between 35-65 cents per gallon. A Berkey® system typically costs about 1.6 cents per gallon.

没办法，实在不放心天朝的某些问题

berkey的各项杂质去除率已经达到了99.5%-99.99%，不想为了那不到百分之一甚至是万分之一的数字放弃那100%的矿物质。
本帖由 iPhone 4 客户端发布

上海这正好有一家直接上门去拿的，名字不知道在坛内能不能公开？

存在即是合理的，相信每个产品都有它的优势吧。这两个牌子我也是犹豫过的，您可以GOOGLE:ro vs berkey，国外有非常多的比较评测，个人认为还是满客观的。大致总结下两者，ro有着更出色的过滤性能（包括对氟，这一点Berkey需要另外购买专门过滤氟的滤芯，而且使用成本不低，大致在10分/升左右），但同时ro也过滤了对人体有益的矿物质，有点感觉像是在喝蒸馏水？我最后淘汰RO的想法是宁愿牺牲那1%不到的劣势去换取保留所有的矿物质。而且RO需要用电，结构复杂，Berkey只需简单的priming和擦拭既可，家里的两台机子从安装到维护都是老妈一个人搞定的
这几个链接是老外的评测文章，供您参考：http://www_bigberkeywaterfilters_com/blog/berkey-water-filters/berkey-water-filters-vs-reverse-osmosis
http://thesurvivalpodcast_com/forum/index.php?topic=41818.0 本帖最后由 060836 于 2014-5-13 22:43 编辑

这是连着black berkey filter 的PF-2滤芯，专门用来过滤砷和氟的

就一小数码的价钱呵呵，刚去拍了下，这是upper chamber，还可以再装两个滤芯提高过滤速度

上一张国外网站做的不同净水器的对比图。可以看到Berkey是两个通过色素过滤的机子之一，也是唯一一个达到净化的机子（区别于过滤）。

据我所知活性炭主要是用来吸附某些物质，但Berkey的滤芯是可以过滤掉病毒的。这个是官方的解释，您可以参考下哈。
这是链接，您可以具体了解下。
我记得3m的机子主要是活性炭吸附吧，对病毒等超微物体就无能为力了，对我来说还有一个很大的问题是，以前有很多的重污染大型工业厂房建在上海城市内，虽然现在关了一些，但不管怎样水里一定会有非常多的重金属残留，我觉得活性炭类的净水器可能不大适合我这里。您在哪个城市？当地工业情况如何？个人感觉一般而言3m的机子作为厨房洗菜等用途应该足够了，喝水的话建议还是需要再过滤下氯残留和重金属。

打算上个空气净化器，有啥推荐的吗？

北京西城的空气质量，20平的小屋子用，设备体积小点的，好操作的，4000元上下的，最好用3-5年不出问题，有吗？