Twice boiled water. You can't boil water twice! Why? Scientific fact or misconception

The water that we use must be of high quality, since our health and well-being directly depend on it. But, since in the tap we have something remotely resembling real water, many are taken to boil it twice to improve the quality. And is it really so?

Does prolonged boiling really improve the quality of tap water? Or is it still impossible to boil the kettle twice?

What happens to water during boiling?

Tap water, which we often use in Everyday life, contains a lot of harmful substances. Here you can find not only chlorine, which is used for disinfection, but also various heavy compounds. It is strictly not recommended to drink such water without preliminary treatment (boiling).

As water begins to boil, organochlorine compounds are formed in it. And what longer water boils, the more such compounds are formed. Organochlorine compounds (dioxins and carcinogens) have a depressing effect on our body. And it's not that the result can be felt immediately after drinking water of this quality. All this will accumulate in the body for quite a long time, until it results in consequences in the form of chronic diseases.

Surely you have noticed that boiled water tastes different. This is also the merit of dioxins, the more of them, the harder the water turns out. But at the same time, chlorine itself has a much more unpleasant effect on the body. That is why it is simply not worth drinking unboiled water. Pediatricians even recommend boiling it for bathing babies. Chlorine can cause skin flaking, itching, and other backfire especially in small children.

What happens if you boil water for a long time?

Here the result is natural, during the boiling process dioxins are formed, and the longer you boil, the more these compounds will be formed. True, in order to bring their content to a critical level (in order to feel an instant effect on your body), the liquid will have to be boiled not two, but even twenty times.


At the same time, do not forget that the taste of water changes, respectively, the water boiled again is already far from ideal. This will change the taste of the tea or coffee you are about to brew. Often employees of various companies and offices sin like this, they are just too lazy to go for water again.

Is it dangerous to boil water several times?

Unfortunately, no one can answer this question unambiguously. The concentration of organochlorine compounds increases with each boil, but their content will not be so significant as to cause poisoning or death. Perhaps the main disadvantage of repeated boiling can be called a change in the taste of water. This greatly spoils tea or coffee, and does not allow you to enjoy the fullness of the taste of these drinks.

At the same time, the content of microbes in boiled water (at least several times turn on the kettle) decreases after the first boil. Everything that could not survive at a temperature of 100 degrees died, and what was able to survive will not kill the second and third boiling. The boiling point is constant and equal to 100 degrees, from the fact that you boil water again, the boiling point will not become higher.

Boiling also rids the water of the so-called hardness salts, since they have a lower boiling point. They settle on the kettle in the form of scale, as you can see for yourself.


In any case, boil or not boil water several times, it's up to you. However, many experts believe that it is impossible to boil water twice, since the process of accumulation of organochlorine compounds in the body still occurs (despite a slight concentration), and no one knows what this can lead to in the future. So is it worth the risk, and then look for the cause of your ailments?

How sometimes it is reluctant to pour out the water left from the previous tea party from the kettle in order to boil a new portion for tea or coffee! And we just put it back on the burner or press the kettle button. Maximum - add water if there is not enough left. Everything is attributed to haste, employment. Especially in offices, where every minute counts and tea parties are almost on the run. But who among us has ever thought: is it not harmful to our health? Can water be boiled multiple times?

What lives in the water?

In order to understand what processes occur with water during boiling, especially when it is boiled again, you need to imagine what composition tap water can have. There are not so few possible "inhabitants" of the domestic aquatic environment:

• Viruses, bacteria, capable of causing various infections. No cleaning and disinfection system can give a 100% guarantee of their complete destruction. Actually, because of them, water is most often boiled before drinking if there is no filter at home. By boiling the water, you can be sure that the harmful "living creatures" will be destroyed.
• Chlorine, which are generously “flavored” with water for disinfection. Chlorine can cause irritation on the skin and mucous membranes (including the oral cavity), and in high concentrations it can contribute to the oncology.
• Salts of magnesium and calcium. It is they who, settling on the walls of the teapot, gradually form the familiar lime scale- indicator of water hardness.
• Heavy metals (zinc, strontium, lead). Under the influence of high temperature, they form carcinogenic substances, which, as you know, are also capable of provoking tumors.

And it's not full list. You can also add sodium salts, nitrogen compounds (nitrates), arsenic here ... How much and what kind of substances are contained in a particular water supply system depends on what composition the water had originally, how and with what it was cleaned and disinfected.

Don't pour a full kettle if you know you won't drink it all: it's tempting to just add a little more next time. It is not worth doing this: the already boiling water will not become more useful, and the new one will mix with it. It is better to drain it completely and boil a new one.

Boil Chemistry

What happens in a kettle of water when it re-boiling? Dangerous viruses and the bacteria die even at the first - the water is disinfected. It is no coincidence that small children are recommended to use boiled water, because it will not cause infections in the fragile intestines. But metal salts, unfortunately, do not go anywhere. Vice versa. Their concentration increases with each subsequent boiling, because the water evaporates, and its volume gradually decreases. In addition, these substances, when heated, interact with each other, forming various compounds. In particular compounds with chlorine. There are more of them, the more the same water is boiled.

Thus, dioxins and carcinogens are formed that are unsafe for human body. Of course, for one tea party there will be no harm to health from them. But these substances are quite aggressive and tend to accumulate in the tissues of the body, causing serious diseases. If you use boiled water for several years, such consequences will be noticeable.

If you boil water several times, the concentration of other substances that can lead to the occurrence of various forms oncological tumors. Nitrates form nitrosamines - carcinogenic compounds that provoke cancer of the blood, lymph. Arsenic, in addition, can cause poisoning, neurological abnormalities, infertility, heart disease, sudden pressure surges, and dental disease.

Some substances found in tap water are not harmful in small doses. But as they accumulate, if the water is boiled repeatedly, they become dangerous. For example, calcium salts. Their high concentrations can affect the kidneys, provoke the deposition of stones in them, cause arthritis or arthrosis.

Sodium salts, in particular sodium fluoride, can seriously impair the mental development of children and cause neurological problems. Therefore, you can’t boil water for babies 2 times (or more!)

Be sure to descale the kettle. Substances that form it can even react with water that boils for the first time.

How to be?

Of course, in the absence of a filter, boiled water is much safer in terms of harm than just tap water. But boiling it a second, third time is definitely harmful, since the compounds resulting from chemical reactions that pass when heated, can accumulate in our body for years until they “shoot” with one or another disease.

Of course, if one day there was no time to change the water and the person drank “repeated” tea, nothing fatal will happen. But for the reasons stated above, this should not become a system. Yes, and the taste of such coffee or tea will be much worse: with bitterness, a metallic taste.

Therefore, it is better not to succumb to your own laziness, but to change the contents of the teapot completely before each tea party. And if the water is boiled in order to disinfect in the absence of a filter, it is prudent to first defend it for several hours in an open container so that the maximum chlorine vapor evaporates.

Laziness is not the best assistant in the matter of health care. We are reluctant to go in for sports, arrange jogging and even walks, cook for a long time (fortunately, semi-finished products are in every supermarket today - for every taste and budget) ... Let at least repeatedly boiled water not add problems. No wonder she is often called dead.

Everyone knows that drinking tap water is extremely harmful. But not everyone has the opportunity to buy bottled water or use special filters. Since time immemorial there has been one reliable way water disinfection - boiling. In the days of our mothers and grandmothers, many had a container of boiled water in the kitchen and children were ordered to drink only from it! Using the same water, some brewed tea or coffee, boiling it again in this way.

And today, many people often boil water several times, mainly for tea or coffee, being too lazy to pour out the liquid left in the kettle from the last time. This is especially true for offices, where one kettle is poured in the morning and water is boiled in it again every time someone wants to drink tea.

But will such a habit harm the body? Some supporters healthy lifestyle life argue that it is impossible to boil water again in any case. How right are they?

To begin with, we will tell you what impurities are contained in tap water.

• A considerable amount of chlorine, which is used to clean it, but can irritate the skin and mucous membranes, and in large doses can contribute to the onset of cancer.
• Calcium and magnesium salts, which, when boiled, settle on the inner walls of the kettle are well-known scale.
• Heavy metals such as lead, strontium and zinc high temperatures forming carcinogenic compounds that provoke the formation of cancer cells.
• Viruses, bacteria and similar microflora.

Water "living" and "dead"

What happens to all these substances during boiling water? Definitely bacteria and viruses die at the first boil. Especially if the water is taken from a dubious source. Heavy metal salts, unfortunately, do not disappear from water, and when boiled, their concentration can only increase due to the fact that a certain volume of water evaporates. The greater the number of boilings, the higher the concentration of harmful salts. But, according to scientists, their number is still not enough to cause significant harm to the body at a time.

As for chlorine, during boiling it forms a lot of organochlorine compounds. And the longer the boiling process lasts, the more such compounds are formed. These include carcinogens and dioxins that can have a negative effect on the cells of the human body. Scientists in the course of laboratory studies have found that such compounds appear even if the water was purified before boiling. The harmful effect of such water will not be noticeable immediately, aggressive substances accumulate in the body long time, which does not immediately lead to the development of serious diseases. To harm the body, you need to drink such water every day for several years.

According to the British Julie Harrison, who has extensive experience in researching the impact of lifestyle and nutrition on the occurrence of cancerous tumors, every time the water is boiled, the nitrates contained in the water heavy metals and sodium fluoride become more dangerous.

Nitrates are converted into carcinogenic nitrosamines, which in some cases cause leukemia, non-Hodgkin's lymphoma and other types of cancer.

Arsenic it can also cause oncology, heart pathologies, infertility, neurological problems and, of course, poisoning.

sodium fluoride negatively affects cardiovascular system, and in large doses can lead to sudden changes in blood pressure and dental fluorosis.

Useful substances such as calcium and magnesium when boiled, they turn into an insoluble form and are not absorbed by the body, and even become dangerous: they affect the kidneys, contribute to the formation of stones in them, and also provoke arthrosis and arthritis.

Especially not recommended repeatedly boiled water for children, because high content in it, sodium fluoride can seriously harm their mental and neurological development. Another fact in favor of the inadmissibility of repeated boiling is the formation of deuterium, heavy hydrogen, in water. Ordinary water turns into "dead", constant use which is harmful to the body. However, scientists are of the opinion that the concentration of deuterium in water, even after several heat treatments, is negligible. According to the research of academician I.V. Petryanov-Sokolov, to obtain one liter of water with a lethal concentration of deuterium, you will have to boil more than two tons of liquid from the tap. By the way, water boiled several times does not change its taste better side, so that tea or coffee made from it will not be what it should be!

To boil or not to boil?

A single boil does not cause significant harm to the body. But it is better to refuse the repeated one, since organochlorine compounds are clearly released with it, even in small quantities, and this is fraught with the body later. It is much easier to acquire a new habit: before each tea party, fill the kettle with fresh water, giving it a little “breathe” beforehand - to weather chlorine and other harmful substances. Do not bring the water to 100C, since there are more and more smart kettles on the market. And be sure to descale your kettle! And if possible, it is better to use natural artesian water without the content of harmful substances.

What kind of water is still poured into the kettle?

We will not consider filtered water now, since many articles have been written on this topic, including on our website.

Artesian natural water of low mineralization is recommended for boiling. Such water does not undergo repeated purification, which is used at urban water treatment plants, does not contain chlorine and other harmful impurities and does not leave scale in kettles. When buying, you should pay attention to the label: total mineralization 100-200 mg / l, calcium up to 60 mg, magnesium up to 30 mg., Hardness not more than 7 meq / l. Also, it is not important that the water of the "highest" category is on the label, since this does not indicate the quality of the water, but only means that it is most likely water purified by the reverse osmosis method and condensed in terms of salt composition. Simply put, soluble powdered salts of calcium, magnesium, bicarbonate, sulfate, etc. were added to the same tap water purified to H2O. It is difficult to talk about the benefits of such “artificial” water;

Probably, every person already knows that water is the most important substance for the functioning of all organs and systems of our body. All doctors strongly recommend that both children and adults drink enough ordinary pure water. And no juices, compotes and other drinks can become a worthy replacement for it. But the opinion of doctors and ordinary people about what kind of water is better to drink does not always coincide. So many people are wondering why you can't boil water twice: is it a scientific fact or a fallacy is this opinion about it?

Many doctors advise their patients to drink water that has only been boiled once. In other words, before adding new liquid to the kettle, pour the rest into the sink. But there are people who are sure that prolonged boiling is guaranteed from various harmful impurities. Who is right anyway?

In daily life, we usually use tap water. And it, as everyone knows, has in its composition a lot of various substances, including those that are not very beneficial to health. It contains not only chlorine, which is necessary for disinfection, but also various heavy compounds. Therefore, it is strongly not recommended to take such water without boiling.

When water boils, organochlorine compounds are formed in it. And the longer the boiling process lasts, the large quantity such connections are formed. They are represented by dioxins and carcinogens and are capable of exerting a depressing effect on the cells, tissues and organs of our body. But Negative influence will not be noticeable immediately, because aggressive substances accumulate in the body for a long time, and then lead to the development of serious, including chronic health problems.

Probably, everyone noticed that boiled water has a completely different taste than "fresh". This feature is also explained by the presence of dioxins in its composition. Increasing their amount softens the water.

It is worth noting that chlorine from unboiled water harms the body much more. Therefore, you should not drink water just from the tap. Pediatricians even advise bathing newborns in boiled water. Excess chlorine can lead to skin flaking, itching and other unpleasant consequences, especially on delicate children's skin.

What is fraught with prolonged boiling?

The answer to this question is hidden in the above information. Since the boiling process is accompanied by the formation of dioxins, the amount of these compounds increases with prolonged boiling. However, it is worth noting that in order to obtain their critical level in water, it will have to be boiled far more than once.

It should not be forgotten that the taste of water changes markedly when boiled. Thus, a liquid boiled twice will already be far from ideal and may somewhat change the taste of brewed tea or coffee. Quite often, water is re-boiled in different offices, when employees are just too lazy to run for a new portion.

Is re-boiling really dangerous?

No specialist can give a definite answer to this question. With each boil, the amount of organochlorine compounds in the water increases, but their level still does not rise to such an extent as to cause serious poisoning or death. So, the most obvious minus of repeated boiling is the change in the taste of water, which spoils the drinks prepared on its basis, making it difficult to enjoy the fullness of their taste.

At the same time, scientists emphasize that the number of aggressive particles (microbes) in boiled water decreases after the first boil. And turning the kettle on again does not affect their viability in any way. After all, what could not survive when the temperature reached one hundred degrees has already died, and the particles that can stay alive will remain even with repeated boiling.

Boiling allows you to purify water from hardness salts, because they have a lower boiling point. Such particles settle on the walls of the kettle, like scale, which is visible to the naked eye.

Which can be said for quite a long time, yet it is more beneficial for the body than tap water. And the decision to boil it again or not, a person must make on his own, focusing on the information provided above. Once again, I would like to emphasize that organochlorine compounds are still released during repeated boiling, albeit in a small amount, and no one knows what this can be fraught with for the body. Therefore, it is better not to risk your health and not be lazy to change the water in the kettle to fresh.

In order for boiled water to bring only benefits to the body, you need to follow a few recommendations:

For boiling, it is worth using only fresh water each time;
- do not boil the liquid again and add fresh to its remains;
- before boiling water, leave it for a few hours to stand - so part of the aggressive substances and chlorine will disappear from it;
- after pouring boiling water into a thermos, do not cork it immediately, it is better to wait a couple of minutes.

Folk recipes

So, it is clear to every person how important it is. But the consumption of insufficient quality water can lead to the development of various pathological conditions. So, if the liquid for drinking contains too much calcium salts, stone formation in the kidneys may begin. Remedies will help to cope with such a problem. traditional medicine.

So with nephrolithiasis, you can use bird knotweed. Brew three tablespoons of fresh and chopped herbs with half a liter of boiling water. Infuse the medicine for four hours, wrap it well, then strain. Take half a glass on an empty stomach in the morning. Appropriateness of treatment folk remedies must be discussed with the doctor.

Ekaterina, www.site
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Any zealous housewife knows that water intended for drinking can be boiled no more than once. However, the physicochemical mechanism of this prohibition can be explained only in the field of molecular physics and chemistry. Despite the preservation of the organoleptic characteristics of the liquid during boiling, its structure and composition of substances change. Why you can not boil water twice, the scientific fact is confirmed by experiments. This phenomenon is caused by several reasons.

Physical and chemical characteristics of water

The structure of the water molecule is known from the school chemistry course. It consists of two hydrogen atoms connected to one oxygen atom. Chemical formula H2O water. The liquid is colorless, transparent, tasteless and odorless. Tap and natural water (river, lake, spring) contains a lot of dissolved mineral chemical impurities, most of which are harmful to the human body. In addition, natural water contains complex macromolecular organic compounds, microflora and microfauna.

Why you can't boil water twice is a scientific fact

The main purpose of boiling water is to destroy harmful and pathogenic microorganisms that die when the temperature of the liquid rises.

Without denying the correctness of all the scientific facts presented, a completely legitimate question arises - Why can't you drink distilled water? ? There are no prohibitions here, but it has been noticed that the distillate, which has neither taste nor smell, also negatively affects human health. Moreover, there is no consensus among scientists about the causes of this phenomenon. According to some scientists, in distilled water, which has passed the stage of steam and then re-condensed, the direction of the charge changes and the magnitude of the dipole moment changes. To restore the original properties, some healers recommend distilled water, which has a high degree cleaning and from the point of view of chemistry absolutely harmless to humans, freeze. For drinking and cooking, it is recommended to use melted liquid.