多谢提醒~不过确实没有想要“纠正”些什么。自己也还在不断的学习中，从没想过自己的东西就是最好的。本意是想大家一起来推荐、讨论各种好东西，互相学习的。现在商家的宣传都不敢信，这才会能自己做些测试就自己做。
欢迎讨论。

为了更好的对比拿了张打印纸做背景

装满了红色色素水的水壶

加入色素

食用色素到货，开始直播测试Berkey滤芯是否能够过滤色素

继购入Big Berkey，Imperial Berkey后，又给亲戚带了两台Light Berkey每台配4个Berkey filter+4个PF-2滤芯 本帖最后由 060836 于 2014-6-1 12:53 编辑

果真这样的话确实太不靠谱了。我是之前在曼哈顿工作参加年度体检，看到报告上有各种微量元素含量之类的指标才知道原来这也能测的。就是不知道精确度怎样了。如果可靠的话我倒是可以推荐那个给我体检的医生给有需要的朋友，就算自费貌似也不贵。

您这么一说还真是之前没想过。多谢前辈提醒。

贴一段国外关于各类净水设备的讨论。原址：http://wellnessmama_com/8079/best-water-filter-options/

What’s In Your Water?

If you are drinking tap water, the answer to that question is 300+ chemicals and pollutants, according to research from the Environmental Working Group. Among these contaminants are:

Volatile Organic Chemicals (VOCs) such as pesticides, herbicides and other chemicals. These chemicals are found in most municipal water sources and even in well and other sources due to agricultural run-off and contamination. Research links certain VOCs to damage in the reproductive system, liver, kidneys and more.
Heavy Metals like lead and mercury are found in some water sources and have been linked to any health problems.
Endocrine Disrupting Chemicals are chemicals that may mimic or interfere with the normal hormones in the body and these chemicals are being found in increasing amounts in the water supply. From this testimony before a congressional committee on the issue: “Over the past fifty years, researchers observed increases in endocrine-sensitive health outcomes. Breast and prostatic cancer incidence increased between 1969 and 1986 ; there was a four-fold increase in ectopic pregnancies (development of the fertilized egg outside of the uterus) in the U.S. between 1970 and 1987 ; the incidence of cryptorchidism (undescended testicles) doubled in the U.K. between 1960 and the mid 1980s ; and there was an approximately 42% decrease in sperm count worldwide between 1940 and 1990 .” These chemicals are known to affect animals when they enter the water supply as well.
Fluoride:  This is perhaps the most controversial of the contaminants in water (if something like water contaminants can be controversial!) because it is purposefully added to the water and there is much heated debate about the benefits/harm of this. Anyone who listened to the Heal Thy Mouth Summit is well aware of the potential dangers of Fluoride thanks to Dr. Kennedy, but the short is: If fluoride has any benefit, it would be directly to the teeth, as drinking the fluoride has not been statistically shown to increase oral health at all. Additionally, fluoride has been linked to thyroid problems and other disorders when consumed internally.
So what are the options for those of us not interested in drinking a chemical cocktail every time we are thirsty?

Bottled Water:

Bottled water has started falling out of favor lately and with good reason. Mark’s Daily Apple did an in-depth analysis of why, but bottled water is not a good option for several reasons:

Chemicals from the plastic bottle itself can leech into the water
In most cases, the water itself is no different than tap water
Bottled water costs more in many cases that drinking tap water
Water bottles are a major source of consumer waste each year!
Verdict: Not the best option on price, taste, or health so I skip it. That being said, having a bottle of water is very convenient, and there are some great sustainable options. Glass and steel water bottles are my personal favorites!

Pitcher Water Filters

Pitcher water filters like Brita use Granulated Activated Charcoal to remove some contaminants. They are less expensive than other filter options upfront, but require frequent filling (especially for large families) and cartridge replacement (making them more expensive in the long run). Since the carbon is not solid, it does not remove all toxins though these filters will improve taste.

Pitcher filters will reduce chlorine, but are not effective at removing VOCs, heavy metals, endocrine disruptors or fluoride. This category also includes faucet mount external filters, which use the same technology.

Verdict: Better than nothing, but doesn’t remove the worst offenders and is somewhat costly to use compared to other options.

Reverse Osmosis (RO)

Reverse Osmosis filtration uses a membrane which removes many contaminants from water. It is usually paired with a Granulated Activated Charcoal filter to remove chlorine and many mount under the sink and have a holding tank. The semipermeable membrane separates many contaminates (which usually have a larger particle size that water) from the water and rejects a large amount of water in the process.

The result is a waste of several gallons of water for every gallon filtered and many naturally occurring minerals (including calcium and magnesium) are also removed from the water. We used this type of filter for a long time but added trace minerals back in to the water to replace the ones that are filtered out. It does remove a large amount of contaminants but is not the best option, in my opinion.

Pros: Removes a large amount of contaminants. Many unites are stored under the sink and have a simple spigot over the counter for getting the water. Does reduce arsenic, asbestos and heavy metals. Does remove fluoride.

Cons: Wastes more water than it produces. Does not reduce VOCs or endocrine disruptors. Requires adequate water pressure to work so it is not usable if home water supply is cut off. Takes up to an hour to filter one gallon of water and filters need to be replaced regularly. Removes necessary minerals from the water.

Verdict: Certainly better than a lot of options out there and does remove fluoride, but not the best due to its waste of water and costly filters.

Distilled Water

The distillation process uses heat to cause the water to become steam. The steam rises and moves to a cooling chamber where it turns back into liquid, leaving behind many contaminants. This type of filtration reduces large particles like minerals and heavy metals but does not remove endocrine disruptors or VOCs since they vaporize at equal or lower temps that water and rise with the steam. It does effectively kill bacteria.

Pros: Removes a large amount of contaminants. Does reduce arsenic, asbestos and heavy metals. Does remove fluoride.

Cons: Does not reduce VOCs or endocrine disruptors. Home distillation systems are often large and expensive.  Use a large amount of electricity and will not work in power outages. Removes necessary minerals from the water. Long term use can cause mineral deficiencies.

Verdict: Better than bottled water, but definitely not the best option out there, especially for home situations.

Solid Block Carbon Filters

Recognized by the EPA as the best option for removing chemicals like herbicides, pesticides and VOCs. Quality carbon block filters will remove chemicals, pesticides, bacteria, fluoride (with filter attachment), heavy metals, nitrate, nitrites and parasites. Most are gravity based and can safely transform any type of water into safe drinking water including rain water, pond water and even sea water (though these types of water will clog the filters much more quickly and are not ideal!) It will even filter water with food coloring to create clear water (yes, I tested it…)

This is the option that we use now and my only complaint is that it does take up counter space. The advantages are that it is gravity based and will work even without electricity or running water. While these types of units can be more pricey that pitcher filters or other filters up front, they seem to be the least expensive in the long run and require the fewest filter replacements (a big plus for me!). These types of filters also don’t remove naturally occurring minerals from the water, making it the best tasting filtered water option, in my opinion.

Using the filter calculator from this site, I’ve determined that the specific system we use won’t need to be replaced for over 20 years with our current usage (though I’m guessing our usage will increase as the kids get older).

The most common type of this filter is the Berkey and it comes in many sizes for different uses. It can even be used camping to filter river water for drinking! (Tested this too and it saved one of my brother in-laws from Giardia when other members of his group got it while camping)

Pros: Filters VOCs, heavy metals, chlorine, fluoride, nitrates/ites, bacteria, parasites and other chemicals. Very inexpensive per gallon cost and infrequent filter replacement. Great tasting water. Doesn’t require electricity or water pressure to work. Portable options can even be used while traveling.

Cons: Does require counter space and does have to be manually filled (not a big deal for us, we just fill at night and we have plenty of water the next day). More expensive up front.

Verdict: This is what we personally use now and we have several different sizes in home and office and for travel. With our family size, the biggest unit with the most filters is a great option, but there are size options for any group size. From my research, this is the best option for removing contaminants without removing necessary minerals.

I’ve found places locally that carry Berkey Filters (Carbon Block) and they are also available online.

Other Notes:

Other water treatment and filtering options that I didn’t evaluate in-depth are:

UV Filters which does kill bacteria and parasites but does not reduce other types of contaminants and is not feasible for home use.
Water softeners which add sodium to the water to reduce calcium and magnesium (thus “softening”) but does not filter or remove contaminants.
Ceramic filters which do remove some contaminants but which are in many cases comparable on price to block carbon filters and which do not remove as many contaminants
Water ionizers/alkalizers which I’ll be addressing in more detail soon, but which Dr. Weil does a good job of explaining here and  which this article elaborates on.
What type of water system do you use? Do you drink tap water? Is water filtration a priority for you? Share below!

我这里的自来水还凑合，但是我还是坚持反渗透，我喜欢喝茶，自来水泡茶，实在没法喝。浪费茶叶。

我家的也是，可以加矿物质滤芯，大约就到8了，我没有PH计，靠比色估计。

等等，你确认自己说的这个没错么？

ps：

我家RO级的出水PH值接近7——说实话我没见过低于6的，甚至低于6.5的都不多

胃酸正常PH=5，只在摄入大量蛋白质（尤其是红肉蛋白）时才降到ph=1，这也是之前说的大量的只吃红肉不好的原因（胃酸分泌过多。RO水的PH=5-7，具体多少跟源水有关，一般而言前后ph值相差1左右。贴一张全美公认水质最好的城市nyc的水质报告，其中ph值这一项中显示，最低要求为6.5，最高8.5，也是另一证明。您既然不相信天朝※※，那nys的呢？

习惯了做面包吃。

1，水里面的矿物质含量微乎其微，你真的认为这点很重要？

2，同1，如果需要补充矿物质，主要还是靠食物而不是饮水，补充剂不过是食物的补充，不是饮水

3，这个所谓理论么，嘿嘿哈哈哦哦

ps：

正是因为信不过天朝的自来水才用RO机，所以哪怕全球除了天朝其他国都在用也没有任何意义，你说是吧