The reason for the smell of water after drilling. Unpleasant smell of water

The absence of color and odor characterizes water in nature. Its dynamic movement through the soil layers saturates it with various organic substances.
The smell of well water is the result of activity biological microorganisms and algae that release unpleasant-smelling compounds. Unpleasant smell water in the well appears due to odorants that are the result of chemical reactions or appear during the life of bacteria and plants.
Rotten egg smell or swamp smell, just ask knowledgeable people and get an exact answer to their reasons.

Causes of unpleasant odors

It smells like hydrogen sulfide, the reason lies in sulfur bacteria that convert sulfur sulfides and sulfates into hydrogen sulfide. Sulfur bacteria thrive in places lacking oxygen.
So:

• In a well or borehole, such places are silt deposits.
• Except unpleasant odor, hydrogen sulfide is also a poisonous gas, which is undesirable to breathe due to unpleasant consequences.
• Even if you take a central water supply system, where water comes from reservoirs, it undergoes several stages of purification, and sometimes you feel a swampy stagnation that cannot be attributed to natural odors.
• Another reason when the water in a well smells like a swamp is the penetration and accumulation of a high content of sulfur pyrite in the aquifer vein, especially one located nearby peat bogs.
• Such water is unpleasant to smell, and if there is no other source and it must be used for cooking, canning and other economic needs, then getting rid of hydrogen sulfide in water is a top priority.
• Before proceeding with the removal of hydrogen sulfide, it is necessary to establish the cause of its appearance. Depending on this, there are various techniques.
• If there is an odor of rot, swamp, rotten eggs or fish, it contains substances from biological microorganisms, that is, the natural origin of the unpleasant odor.
• smells of hydrogen sulfide, chlorine, petroleum products and other similar things chemical elements, then this signals anthropogenic pollution, or the result of human activity.

Attention: When developing the water quality standard, it takes into account the effect of hydrogen sulfide gas on taste and odor, and not its toxic effects.

• Determination of the exact source of the unpleasant odor is carried out after research in a specialized laboratory for bacteriological analysis.
• If a certain colony of bacteria is detected, they need to be neutralized and eliminated.

Hydrogen sulfide removal method

Nothing lasts forever under the sun, not even hydrogen sulfide

The direct connection between the cause of the appearance of hydrogen sulfide and the method of purification from it is beyond doubt. The water in the well has an odor; it is urgent to carry out a detailed chemical and biochemical analysis.

Physical or oxygen method

There is one important point in carrying out this analysis:

• A specialist from the laboratory will literally have to be invited “to your home.”
• it is necessary to test for hydrogen sulfide content, as they say “on the spot,” that is, immediately after release. This is caused by the activity of hydrogen sulfide molecules, and their ability to immediately react with oxygen molecules in the air.
• At the same time, they turn into a safe sulfur-containing compound and a water sample brought to the laboratory will contain ordinary sulfur.
• This molecular activity makes it possible to use the most widely used and very simple method of physical aeration of water.
• Simplified aeration consists of spraying and flying drops through air flow from the spray nozzle to the water mirror, the video in this article will help you understand the mechanism of action.
• Vacuum ejection decarbonizer - highly efficient device aeration of water, air suction into the water flow is done using various designs.
• Pressure aeration, which involves the forced supply of air by a compressor.
• The essence of the method of aeration of water containing hydrogen sulfide is the interaction with oxygen in the air and the creation of conditions when the concentration of dissolved hydrogen sulfide in the water becomes acceptable.
• The photo shows that aeration units differ in size and are divided into types; price also contributes to their difference.
• Film degassers, which are columns with nozzles and water flows through them in a thin film.
• Foam degassing units, purged compressed air through slowly degassed water.
• Vacuum degassers, where vacuum pumps and steam-water-jet ejectors, maintaining normal temperature in a vacuum environment, cause water to boil.

Attention: Sulfur bacteria are destroyed by forced aeration of water, and the water is additionally saturated with oxygen, which is one of the advantages of this method. The disadvantage of this method is the energy consumption of bulky aeration equipment, which requires the use of an additional pump.

Chemistry in the service of water purification

Why does the water in the well smell and how to use chemical cleaning to remove hydrogen sulfide and whether it will turn out worse, since any chemical reaction has decomposition by-products.
So:

• The chemical cleaning method is based on the property of hydrogen sulfide as a strong reducing agent that can be neutralized by a strong oxidizing agent.
• Sodium hypochlorite, thiosulfates, sulfates and sulfides, potassium permanganate, ozone, free sulfur and others are used as oxidizing agents.
• The method is used with good results and complete water purification, except for artesian wells, which lie at a depth of over 40 meters, and the chemical reaction produces a secondary decomposition product.
• Previously, instructions were often used to use free chlorine to bind hydrogen sulfide with additional coagulation and filtering of water through activated carbon.
• It is difficult to purify water from a well using this method.
• Hydrogen sulfide removal is carried out by constantly adding manganese sand to filters that have accumulated waste manganese from glauconite sand, which is used, in turn, to purify water from soluble iron and manganese.
• Double regeneration is carried out using the oxidation of potassium permanganate, which turns into insoluble manganese hydroxide in the process chemical reaction. IN in this case it acts as a coagulant and adsorbent.
• Another method of neutralizing hydrogen sulfide is performed with hydrogen peroxide, the result is the resulting sulfur.
• Next, the water is further filtered through Activated carbon and the smell completely disappears.

Biochemical oxidation

So:

• This method implements the scheme of an aero-oxidizer or a primary settling tank, an aeration tank operating in the complete oxidation mode or a secondary settling tank, purification from hydrogen sulfide in a biochemical oxidation reactor and with the help of filters operating in the rapid filtration mode.
• To prevent the sulfur from turning back into hydrogen sulfide, it is recommended to inject chlorine into the filter water pads yourself or blow them with air.
• New methods for removing hydrogen sulfide can include: catalytic oxidation on ion exchangers.
• Modern cleaning systems contain a comprehensive solution for purifying not only hydrogen sulfide, but also manganese, iron and other undesirable impurities.
• These filters are equipped with a durable fiberglass body that is not subject to corrosion, have manual or automatic system control, drainage and distribution block and filtering, granular backfill with a supporting layer of gravel.

Once again about cleaning, which should be done only after careful analyzes of soil and water samples in order to correctly select the right method and get rid of the smell.

It is difficult to overestimate the importance of private water supply country house from a borehole or well. It is convenient and profitable, and is often the only source of life-giving moisture. However, situations often arise when the water from a well smells of hydrogen sulfide.

This situation is not only unpleasant, it is far from Chanel No. 5, it is very dangerous. The cause of this phenomenon is hydrogen sulfide, a colorless gas, but its characteristic smell - rotten eggs - will not leave anyone indifferent. In high concentrations, it can paralyze breathing and lead to death. In concentrations of 4.5% or more in the air, hydrogen sulfide is explosive, the combustion temperature is about 260 o C. A great danger to humans is the body’s ability to adapt to the aroma, gradually ceasing to feel it. At the same time, the effect of hydrogen sulfide on the body does not change with all the ensuing consequences.

In addition, hydrogen sulfide is an active oxidizing agent, which affects metal parts plumbing system. The walls of the pipes quickly corrode and become covered with a black coating that has a characteristic odor. One way to minimize losses is to use modern plastic pipes for water supply.

The metal intake pipe of the well and all the metal fittings have the same deplorable appearance, and this deposit is very difficult to clean, but it must be done.

Most often, hydrogen sulfide appears in muddy, swamp-smelling water from a stagnant water intake. This may happen for the following reasons:

1. A well that has not been working for a long time has silted up, that is, a sediment of sand and silt has formed at the bottom, which is a reservoir anaerobic bacteria feeding on organic matter, this produces hydrogen sulfide, the cause of an unpleasant odor and a potential poisoner.
2. The casing of the walls of the water intake is damaged with the formation of cracks through which external contaminated water with impurities of a nutrient medium for bacteria enters the well.
3. Active use of fertilizers containing sulfates and sulfides is also favorable for the activity of these microorganisms. This is especially typical for water intakes based on groundwater, wells, and Abyssinian wells.
4. The presence in rocks of natural sulfates and sulfides that contribute to the formation of hydrogen sulfide.
5. Sulfur getting into the well during drilling work.

Remedies

This is a complex multi-step process in which there is no important points, all of them must be unconditionally carried out in order to get rid of the smell and harmful consequences for the body.

• Water intake logging. Required operation to determine the nature of the well failure. Produced using special equipment by a qualified specialist.
• well cleaning. This must be done in order to remove sandy and silty sediment from the bottom of the well, which, most likely, is the source of the unpleasant odor and the main place of formation of hydrogen sulfide. The work can be done using various methods, including washing away sediment with a jet of water while simultaneously removing agitated soil, mechanical destruction of settled masses with continuous removal dirty water and some others. This is why you need to have a vibration pump in stock that matches the size of the well;
• pumping up water intake. This must be done to remove contaminants in places adjacent to the filter surface and eliminate stagnant zones in them. It is advisable to rinse the filter surface from the inside with water under pressure. The water needs to be pumped out until it is clear. clear water without smell.
• casing replacement. The reason for the need for such an operation may be mechanical failure of the casing pipes or the formation of fistulas due to corrosion. When removing the casing pipe is impossible due to its dilapidation, additional smaller casing is installed inside the worn-out one. This can be done in the case when the construction of the well provides for such an operation for the future by choosing a “repair” size for re-casing.

It is possible that the listed measures will not give the expected effect in full. This may mean that the cause of the unpleasant odor and cloudiness of the water is objectively present outside the water intake. Perhaps this is a temporary phenomenon associated with some atypical phenomenon. In any case, the duration of the unpleasant circumstances is unpredictable and additional measures must be taken to purify water from the well before use.

Cleaning methods

Treatment of liquid before use is an indispensable condition for the safety of its use. It is connected not only with the presence of hydrogen sulfide in water, but also for deferrization, and for the elimination of other undesirable impurities, including heavy metal salts. Cleaning must be done in any case, regardless of the color, taste, smell and horizon of water intake.

From a variety of cleaning methods, you need to choose the one most suitable for the actual chemical composition liquids. Therefore, before going to the store, you need to submit water samples for analysis to the SES or the laboratory of the local water utility, where characteristic impurities, pathogenic bacteria and harmful chemicals will be accurately determined.

Gravity water degassers

This device consists of a tank installed in a high point (attic). It is supplied with water from a well by a pump. In this case, the supply device is equipped with a showering device that supplies water with a jet-drip flow, providing a large surface of its contact with air oxygen. Active oxidation of impurities occurs with the formation of an insoluble precipitate, which is then deposited in special filters. Additional aeration is produced by spraying air into the water column, for which you can use ordinary aquarium aerators. Good results are obtained by treating liquids with ozonation. Why? Ozone is chemically more active than oxygen in the air.

Removing harmful gases from well water is a preliminary operation before filtration, where the final purification of the liquid is carried out using appropriate filter elements. After this, the smell will disappear due to the elimination of the cause of its occurrence.

Pressure degassing

With this method, the capacity of the device can be smaller and it can be installed anywhere, even in the basement.

A well on a site is the easiest way to cover the household and drinking needs of the people living on it. However, such water intake has many disadvantages, and the most important of them is the possibility of water pollution. That is why well owners have to regularly clean them and monitor water quality. However, sometimes even with proper care, the water in the building becomes worse. This becomes clear from the unpleasant odor and cloudiness. In this case, it is necessary to urgently find the cause and eliminate it. We will tell you how to understand why the water in the well is cloudy and why it has an unpleasant odor.

Almost every well owner has at least once encountered the problem of deteriorating water quality. There can be many reasons for this:

• If the well was dug incorrectly, that is, the shaft design has defects, then the water may deteriorate.
• Shortcomings during the commissioning of a hydraulic structure can also lead to problems with water quality in the future.
• If there is no filter in the well or it is not installed correctly, this will definitely lead to water spoilage.
• With rare or seasonal use of the water intake structure, water stagnation will occur and this will lead to a deterioration in its quality, even if your well is relatively new.

If water from a well is clear, tasteless and odorless, this does not mean that it can be used for drinking and cooking. To accurately understand whether water from a well can be used for drinking, it is worth taking the liquid for analysis to the appropriate laboratory. Conclusions about the purity of the source must be made not only on the basis of the organoleptic characteristics of the liquid (color, smell, transparency, taste), but also on the results of analyses.

The main causes of pollution include:

• Various mechanical pollutants, siltation and suspended matter can reduce water quality.
• Organic pollution occurs when microorganisms and algae multiply in water. In this case, the contents of the well smell like swamp, grass or rot.
• When various chemicals enter the source, the water becomes unfit for drinking. For example, even the soil itself contains components that, when dissolved in water, change its smell. These include ammonia, manganese, iron, hydrogen sulfide. Human waste, such as chlorine or industrial petroleum products, can also get into the water.

Attention! In most cases, conclusions about the causes of liquid contamination at the source can be made based on an assessment of the transparency of the water, its taste and smell.

If the water in the well foams, this can happen for several reasons:

• Availability large quantity organic impurities;
• the presence of suspended solids in a dissolved state;
• high acidity of water.

Signs of contamination

Turbid water in a well is the main sign of contamination. If you collect liquid from a well into a transparent container and hold it up to the light, then small particles of sand, silt, and a suspension of various small pollutants will be clearly visible. Moreover, depending on the concentration of certain particles, the water may be not just cloudy, but yellow or brownish.

The cause of such contamination may be stagnation of water in the well or siltation of the source. If the well long time It is not used because the liquid from it smells like a swamp. Siltation can also occur due to poor sealing of the rings or compromised wall integrity. To cope with the problem, you need to do mechanical cleaning and repair of the well or well.

Based on the condition of the water, its smell and color, you can independently draw conclusions about contamination with certain chemicals:

1. If it seems to you that the liquid in the well is rotten, that is, a persistent smell of hydrogen sulfide has appeared, then the reason for this is the activity of bacteria. As a result of the decomposition of organic substances, the smell of hydrogen sulfide appears. We will consider what to do in this situation further in our article.
2. If the contents of the well smell of iron, and the water is yellow or rusty, then the source is oversaturated with iron. In addition, dirty reddish water will leave a residue on dishes and towels. To solve the problem, you can deepen the well to a cleaner aquifer or install a high-quality treatment system.

It is important to know: water with a high iron content may turn yellow within a short time after pouring it into a container after extraction from a well. The thing is that this color appears due to the reaction of iron with oxygen contained in the air.

1. If the contents of a well or well smell like rubber, petroleum products, kerosene, plastic and others chemicals, then dirty wastewater containing chemicals from manufacturing enterprises. In this case, the water may not only be yellow, sometimes it foams, and when contaminated with manganese it turns black.

It is worth knowing: a small content of manganese in water will not make itself felt, but if the concentration exceeds 25 mg/l, a precipitate will form and the water will turn black.

What to do if the water smells of hydrogen sulfide?

As you already understand, water has the smell of hydrogen sulfide if organic matter, namely sulfur bacteria, multiplies in it. The question then becomes how these microorganisms get into the well. The answer is simple - they live in silt, which forms as a black sediment at the bottom of a hydraulic structure. Thus, we can say the following: if the water in your well goes dry, it means you are not cleaning the bottom of silt deposits often enough.

It’s worth knowing: hydrogen sulfide itself is not harmful to humans, but drinking water with such a smell is quite unpleasant, so you need to get rid of it.

To get rid of hydrogen sulfide in water, you can use the following purification methods:

• Physical measures involve the use of an aerator for weathering. An increased oxygen content in water will lead to the death of sulfur bacteria. As a result, the unpleasant smell of hydrogen sulfide will disappear.
• Chemical methods. To get rid of these bacteria for a long time, it is worth pouring ozone, hydrogen peroxide or sodium hypochlorite into the well in the specified proportion.
• Carbon filters should be classified as mechanical methods cleaning. They will not only remove the smell of hydrogen sulfide, but will also purify the water of other impurities.

Filtration method of water purification

If you don't know what to do about the smell of iron, manganese or hydrogen sulfide, use filters. For these purposes, you can use different filter devices:

1. The Barrier filter can reduce the concentration harmful substances 3 times and remove the unpleasant odor.
2. A three-component filter unit will remove mechanical impurities, organic matter, chlorine, salt compounds and heavy metal particles.
3. To completely get rid of dissolved iron, you should use a modification of the Ferrum filter.
4. For comprehensive water purification and softening, it is better to use the Complex model.
5. Reverse osmosis systems are considered the best purification devices.
6. To eliminate ammonium ions, impregnated carbon filters are used.

Mechanical cleaning

Regular cleaning of hydraulic structures is best done at least once a year. The procedure is carried out in several stages:

• Using a powerful pump, all water from the well is pumped out.
• Further by mechanical means the bottom and walls of the hydraulic structure are cleaned of dirt and sediment. A winch is used to lift silt deposits from the bottom.
• The joints and connections of the rings are carefully inspected. All cracks and damage are sealed with sealant.
• Then the walls are disinfected using special preparations. They are used according to the instructions.

Disinfection

Most The best way To get rid of harmful microorganisms and bacteria is to disinfect with chlorine. This method is simple and cheap. It is usually used at the final stage of mechanical cleaning of a hydraulic structure.

After filling the well with water, it must be completely pumped out. This water change procedure is repeated several times to get rid of the high chlorine content in the water.

Everyone is fine autonomous water supply, allowing you not to depend on centralized water supplies. It’s just that you have to take care of cleaning it yourself.
Many homeowners are confident that if they drill a deep enough well to extract artesian water, it will a priori be clean. And then they rack their brains - why does the water from the well smell of hydrogen sulfide?
In fact, the presence of hydrogen sulfide, iron, heavy metal salts and other impurities in it is far from a rare occurrence. And drinking such water is not only unpleasant, but also very dangerous.
In this article we will talk about the reasons for the unpleasant odor of hydrogen sulfide in well water and ways to eliminate it.

What is this substance and what to expect from it

Hydrogen sulfide is a gas dissolved in water that gives it an unpleasant taste and odor. It is formed during the decomposition of protein as a result of the activity of anaerobic (living in an oxygen-deprived environment) bacteria.
Therefore, it has the appropriate smell - rotten eggs, decaying organic matter.

Where does hydrogen sulfide come from?

Sulfur bacteria, which convert sulfates and sulfides dissolved in water into hydrogen sulfide, live in an environment that does not receive oxygen. This may be silt at the bottom of a well that has not been cleaned for a long time (see) and aquifers “clogged” on all sides by waterproof soils.
That is, hydrogen sulfide is most often found in water from artesian, deep wells.

The main culprits of pollution are sulfur bacteria

And its highest concentration is observed in the following cases:

• In wells and during floods or during periods of heavy rainfall, when all kinds of organic matter along with surface waters seeps into the ground.
• When a drilled well enters a formation with deposits of sulfide ores.

For reference. Usually, big cities arose precisely in the area of ​​ore occurrence. Therefore, most often water from a well with the smell of hydrogen sulfide is found in industrial areas and regions.

• When a well loses its tightness and sulfite bacteria penetrate into it from the soil.

What is the danger?

We have already said that the smell of hydrogen sulfide is extremely unpleasant. It is simply impossible to drink such water no matter how much you want.
But this is not the worst thing:

• The asphyxiating gas hydrogen sulfide is very poisonous and volatile. The smell quickly spreads throughout all rooms in the house, and prolonged inhalation of such air causes acute poisoning and other unpleasant consequences.
• Dissolved hydrogen sulfide in well water has a strong acid reducing effect. When it enters the body, it disrupts natural life processes, including iron oxidation.
• This substance is also dangerous for household plumbing fixtures, metal pipes and shut-off valves. It is highly corrosive and, when interacting with iron, destroys it.

There is only one conclusion: this smell must be gotten rid of; the water must be purified from hydrogen sulfide. The price of the issue is your health and that of your loved ones. Not to mention the costs associated with frequent plumbing repairs.

Cleaning methods

If the water in the well smells of hydrogen sulfide, you need to think about cleaning it. There are several ways to do this by installing special units in the house.
It should be said that the choice of water treatment scheme is made on the basis of the complete content of various dissolved and undissolved impurities, viruses and bacteria. Such an analysis cannot be performed with your own hands; it is carried out in special laboratories, where they determine not only high-quality composition water, but also the amount of substances present in it.

Note. Sometimes, to purify iron-containing water from hydrogen sulfide, it is not necessary to install any special equipment, since iron removal filters can eliminate it. It is enough just to choose the right dose of reagents.

Physical way

Hydrogen sulfide is a volatile gas; it easily disappears from water if it is allowed to stand for some time. But we have long been accustomed to the fact that water does not sit in buckets, but flows from the tap, so such settling must be done before it is supplied to the water distribution system.
For this purpose, non-pressure and pressure degassers are used:

• Non-pressure installations are volumetric non-pressurized plastic tanks(metal ones will be subject to corrosion), into which water is supplied through spray nozzles (shower method).
  Even during the feeding process, it is saturated with air oxygen, which has a detrimental effect on sulfur bacteria and oxidizes hydrogen sulfide.

• The remaining substances gradually erode through the water surface, and to speed up this process, you can additionally install an oxygen compressor in the tank.
  Pressure installations differ from non-pressure installations in the smaller volume and method of supplying water to the system. It rises from the bottom of the container, where it is actively saturated with oxygen using a pump.

You can install such an aerator on the ground floor or even in the basement of a building.

It is also based on the oxidation of hydrogen sulfide, but in this case the oxidizing agent is not oxygen, but other substances - ozone, hydrogen peroxide, sodium hypochlorite. During the oxidation process, insoluble compounds such as sulfur, sulfates and thiosulfates are formed, which, while passing through a filter with granular loading, are retained by it, and already purified water is supplied to the system.
In the photo - a filter for removing hydrogen sulfide with a cover and control unit

Sorption-catalytic method

This method is based on the ability of sorption materials to accelerate oxidative reactions. One of the most effective sorbents in this regard is granular activated carbon with increased catalytic ability.
Instructions for using this method require the presence of a high concentration of oxygen in the water, so it is used in combination with pressure aeration.

Note. Sometimes the smell of hydrogen sulfide in water from a well after it has been cleaned occurs when passing through a water heating installation. That is, only hot water smells. This suggests that salt deposits have accumulated on the heating elements of the boiler, in which sulfate-reducing bacteria develop. Thorough flushing of the water heater and installation of a sorption filter will help eliminate the problem.

Conclusion

Purifying water from hydrogen sulfide is not just about eliminating an unpleasant odor and restoring the normal organoleptic properties of water. It is necessary to ensure that the liquid you drink and use for hygiene purposes is safe for your health and does not lead to rapid destruction of the water supply system.
More information about different methods You will get cleaning by watching the video in this article.

The smell from the source is caused by the presence in it of an excessive concentration of hydrogen sulfide, iron compounds, and ammonia. They accelerate the process of rust on everything metal that is in the well. In this case, the development of sulfur bacteria takes place, which leads to a nauseating stench. These bacteria reduce sulfur salts (sulfides, sulfates) dissolved to the state of hydrogen sulfide.
It is known that 0.05 mg/liter of hydrogen sulfide gas gives bad moisture. In an aerated liquid this “aroma” is not felt. It is not dangerous when taken internally. The fact is that toxic effects on the body have also not been established.

By the way, the threshold of permissible concentration within 0.03 mg/liter already coincides with the threshold for the perception of taste and smell in humans.

But sulfides into which hydrogen sulfide is converted are recognized as dangerous. They affect the mucous part of the intestinal tract, with symptoms of vomiting and abdominal pain.

There is also evidence of signs of heart disease, the cause of which is the same sulfur compounds, especially sulfides.

The concentration of hydrogen sulfide in wells, including deep ones, can be traced in cases where the trunk enters a horizon of sulfide manifestations. And such pools of underground springs contain a large volume of sulfur salts. Removing them, taking into account some features, involves:
Removing iron salts from water just removed from a well. The specific smell of rust appears a little later, after moisture reacts with oxygen in the air.
Eliminate odor ammonia, which indicates the presence of ammonia compounds in it.

The cause of the heavy odor may be:
- chlorine compounds, often used in systems for removing bacteria, viruses and other microorganisms. Chlorinated well water can play a role in limiting the number of pathogenic microorganisms.
- organic substances that impart a musty or earthy odor;
- mineral components that also add a soda or salty taste to the moisture;
- manganese salts also change the smell of water.
Despite the undesirability of consuming such a “fragrant drink,” it is nevertheless used for food. One can argue about the taste of such a dinner.

Bad odors from wells are not uncommon. And their source is the life and activity of innumerable bacteria. Their decomposition is the basis for the saturation of the source with hydrogen sulfide.
A similar “incense” can be caused by a high concentration of manganese (more than 20 mg/l).
The swampy or rotting stench from the well also comes from bacteria and organic components.
The specific and, at the same time, familiar smell of iodine is a very serious phenomenon. The reason for this is drainage industrial enterprises, penetrating into soil layers and recharging the well. Iodine releases the toxic element phenol, which disrupts the functioning of nervous system. Drinking such a “drink” is strictly forbidden.

So, water is practically never found pure, since it contains all kinds of dissolved microorganisms and mechanical substances. Some of them, while not harmful to health, in themselves, in combination with certain chemical elements, can have a very serious effect on a person.