厂家可以拿去这样对外宣传了。自我矛盾的解决，特别注意不要侵犯了英国某品牌的专利，老外最喜欢。
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多谢朋友肯定！

牛不要吹破了，美国独立多少年？
制造业大幅提高工艺精度是计算机技术在工业化生产应用后才开始革命的。
手工作坊制造出宣传中能过滤多少多少微米的东西，并使用２００年※※，穿越的可以。

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http://www_alpharubicon_com/kids/homemadeberkeydaire.htm

Although it reduced our TDS from 400ppm (tap water) to 320ppm (Berkey Filtered), we took filtered water <2ppm and put it through the Berkey only to find that it then read 280ppm TDS. What in the world is it adding? Why? We will be returning this product and going a different route. Live and learn...

I ordered this item expecting it to be wonderful and to give me clean water. We assembled it, cleaned it as directed and no matter how many times I tested the water it was never cleaner than the water I get from the Glacier Water Machines. This product was too expensive not to get the clean water it advertised. I sent it back and continued to get my water for $1.75 through the Glacier Water machines. Very disappointed.

I am very frustrated with this product. After doing much research on water filters, I was very excited to get the Big Berkey. My first attempt, the package came only with the filters, no container. The second time, after putting it all together, it leaked all over the place. I've tried a few times, filling it with water, only to find the counter flooded after a few hours.

For $300 I expect a tin can to at least look good. Item was received with dents and the "Berkey" logo was stamped crooked. Craftsmanship has gone to the wayside.

We have recently received our new Berkey system, and when reading your company's instructions, a couple of questions have come up that we hope you can provide an answer to.

1) You are using a test to determine the aluminum reduction using the PF2 filtration element.
a) Is this an in-house test or an official external test by a neutral third-party provider?
b) This test cannot distinguish between the activated alumina (alumina
oxide) and the aluminum.

2) In document PF2-Instructions - 8-13 it states that after 5 cycles you have test results showing activated alumina levels of .178 ppm.
a) Is this now a different test that allows you to find only the Al3O3?
If so, is this an internal test or a certified external test?
b) Why do you note aluminum oxide levels for toothpaste, and the PF2 elements, but aluminum for the boiled water?

3) Is the following a correct understanding: Your test has an influent of
.320 ppm and an effluent of .232 after 3 cycles, both alumina and aluminum combined. Alumina for that level of cycles is .178 ppm, so the aluminum reduction must have been (0.320 + 0.178) - 0.232 =0.266 ppm

Thank you for your assistance in helping us learn and understand!

Kind regards,

I bought this filtration product after reading about how great it was and how it was the best on the market! I had it for 3 months and the "filtered" water started to smell really bad; then shortly after the black filters fell apart in the upper chamber. I mean they were broken and floating in the water. I had extra filters on hand and replaced those filters and the same thing happened. I am very displeased with this product and I wish I could get a full refund for this abomination they call a water filter over 300 dollars wasted.

It leaked. Very OVER PRICED for this product. Very slow to filter water. Also it looked like it had been used before. Shipped product minus filters had to return who;e unit instead of just sending the white fluoride filters so I just returned and I will go another route,

For the amount of money very disappointed. The unit went together fine. My problem started when the valve started leaking. OK, no problem, I thought. So drain water tighten valve and oh look the butterfly plastic retainer nuts that hold the filters in place are cracked. Hmmm odd. Well the only thing I can think of when I drained the water and moved the container the filter vibrated and cracked the nuts. For I also had the fluoride filters hanging from the bottom. So since I ordered the unit from Amazon I called Berkey direct to buy two new sets of nuts. What do they ship? Only one set! Ok the other set was a backup since the nuts are poor quality plastic and will break again. So prime everything put back together, fill with water. I pickup the top half to watch and make sure the water is flowing and what do I see. Water coming out of the two plug holes. Hmmmm odd? So I twist the one plug to loosen and re-tighten and what happens? IT CRACKS! unbelievable. The plastics are very poor quality. But the stainless steel looks great. I have already printed the return forms from Amazon. Oh the two days the unit worked the water tasted GREAT.

Received the Berkey as a gift. Thought it was great for a month filled the top tank everyday for about a month. By the end of the month it would take 24 hours to filter half the top reservoir. Cleaned it with a new scotch brite, primed and reassembled it. Filtered 1 tank in 12 hours and stopped filtering in about a week. Cleaned it again with a stiff tooth brush. Filtered about half a tank and stopped. Tried cleaning it 4 more times but it still only filters about half the tank in 24 hours.

Called Berkey customer service and told him the story. Also told him that our water is well water and appears to have a lot of calcium. He told me he would have to ask his manager. When he came back he told me since the filter worked fine to start and only clogged after a month of use the system was working as it should. There was nothing they could suggest or do. He said I must have to much particulate in my water. Would I like to purchase new filters at $107. I told him to filter water for 1 month? Not likely!

I have this water tested yearly and it passes as good water. My neighbors drink this out of their tap. I may try one more set of filters and prefilter with a Brita. otherwise I recommend be careful as this system is expensive and the company seemed rather cold to me. With what I know now, I would not buy one

The spigot is PLASTIC. It off-gasses and broke after a few uses. The fluoride water filter is encased in---PLASTIC. What's the point here for paying this much money?

If you foolishly promote their business by buying something from them, buy the ceramic filters and DIY.

好贴！这才是纯粹的无忌精神！
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难道其他不锈钢制品就不需要人工、物流、各种税费、工厂机器投资及每年折旧、仓储……请继续补充。

参见膳魔师的双层保温不锈钢制品，难道单层不锈钢制品比单层要贵的离谱？

我贴中说的去繁就简就考虑了这个压力与过滤之间的矛盾，说的是选用更高密度的滤芯。至于行不行，我不是专业人员，只是觉的我的想法还是比较符合物理学基础常识的。

另外，我不太相信您说的那工程师的话，本身一个简单的过滤原理，将它上升到制造方已经考虑了自然水压环境中进行离子交换或者是化学反应，这是违反科学的。假设制造方使用了化学反应方式，谁能保证化学反应方式科学安全？既然是化学方式，那么反向水流清理是什么原理？化学反应方式保证能反复使用如此之久而不发生安全问题？至于离子交换，呵呵，用您说的颜色试验是不足以证明的，玄学的可能高于科学的可能。假设相信它能离子交换，那么自带的离子交换物质完了，不是单纯的反向水流冲洗就能恢复离子交换能力的。

对了，验证滤芯是不是有瑕疵或者接口是不是密封，用食用色素测一下就好了，有任何问题非常容易就能发现。请参见本帖之前的运动水壶滤芯的测试~

据我所知，陶瓷只是该滤芯的一种材料，总共有超过6种不同材料构成。至于您说的外壳价格暴力。我觉得您是不是只算了材料成本，忽略了人工、物流、各种税费、工厂机器投资及每年折旧、仓储……请继续补充

您说的diy，其实在国外还是很普遍的，说穿了，重点就是滤芯而已。我也问过berkey的工程师是不是能把滤芯装在封闭的容器内进行增加以加速水流，答案是不行。原因是当水流速度超过设计时，水中的重金属等离子无法获得足够的时间和滤芯材料进行离子交换或者是化学反应，将降低滤芯的过滤效果，虽然在极限状态下，滤芯的过滤效果还是要好于大部分市面上其他的产品，但为了保证滤芯在最佳状态下工作，他们不建议增压操作。

原装的桶确实是304钢或者non-bpa材料的。滤芯的出水速度直接跟水压相关，水压越高，速度越快，而且差异很明显。以我正在用的big berkey为例，从装满到漏下去一半大概只需2个小时不到，剩下半桶漏完可能要5个小时甚至更久（主要是由于最底下几厘米几乎都没有水压了）。反过来，如果用水多的话就多加几根滤芯或者多加几次水就行，我现在用四根滤芯，一天顶多加两次水，可以满足2-3个人洗菜做饭喝水。

继续顺着前面的思路走，去繁就简，使用质量靠谱的陶瓷滤芯的龙头式净水器即可免除上下桶存储水源而可能形成的二次污染。在出水量一致的情况下，利用自来水自身的水压，可选择过滤密度更小的陶瓷滤芯，岂不更方便安全？

科技含量就在这个玩意上，其他diy太容易。
楼主所说的塑料桶的问题，一般pp材料的桶绝对没问题，其他塑料的只要不装热水也问题不大。不过既然都玩到净水设施了，当然最好是pp塑料或304不锈钢。

2滤芯的出水速度如何，打算搞个户外烧烤用，供5-10人饮用。

请行家聊聊这两个品牌的最大优势是什么，能不能推荐个具体型号？万分感谢

老婆用的法拉利设计意大利制造吹风机

烧个吃的~加拿大产有机野生大米。图中两点为有机黄米。