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Water pool and chemical composition.
Water pool and chemical composition …
There is a truth that not many people notice, that the swimming pool (especially the outdoor tank) is considered one of the most polluted places. These tanks are often exposed to the outside environment, susceptible to infection by dirt, bacteria, spores spores in rain water, bird droppings … 
In addition, pollution sources in the pool also include microorganisms, the amount of oil excreted in the body to swim like sweat, cosmetics, sunscreen, urine, saliva …

Therefore, the pool must be treated chemically before being put into use.  The indispensable ingredient in swimming pool water usually consists of chlorine. This is a chemical used to disinfect, destroy the components that cause water pollution. 
Chlorine is used in two main forms: calcium hypochlorite (solid) and sodium hypochlorite (liquid). These two compounds work with water to form hypochlorous acids. This acid kills bacteria and pathogens by breaking down lipid membranes, destroying enzymes and larvae within the bacterial cells through oxidative reactions.
However, hypochlorous acid is easily broken down when exposed to ultraviolet light from sunlight. Therefore, in order to ensure effective water treatment of the tank, cyanuric acid is usually added, reacting with free chlorine in hypochlorous acid to form a more stable compound. 
Finally, alkaline chemicals such as sodium carbonate or sodium bicarbonate are used to maintain the pH balance of the water. A standard pool must have an average pH of 7.2 – 7.8 according to the Langelier Saturation Index.
In addition, some swimming pools are added green chemicals, creating effects on water swimming pool seawater but not harmful to the user.
The process of swimming pool water treatment
To get comfortable hours in the pool, cleaning and swimming pool water is always a top priority. Depending on the frequency of use, the area of ​​the tank and the weather conditions, the environment, each pool has different ways of cleaning the water tank. However, in the process of processing the above must achieve the following:
First, the pH of the pool water should be checked regularly.  Water that is too low or too high is harmful to the health of the user. One unpleasant thing about swimming is that not too much chlorine can cause too much chloramine (chemicals made by hypochlorous acid with ammonia in the urine). In order to handle this situation, it is even necessary to add more chlorine to the tank. 
Secondly, swimming pool sanitation needs to pay attention to both tank hygiene.  This means that the swimming pool water must be completely discharged and disinfected into a chemical tank. This work eliminates the possibility of moss or algae in the pool water when used

Third, we need to clean the pool water filter. The tank water should pass through a sand filter or humus filter to remove the contaminants first. However, this filter should also be regularly cleaned, care to avoid accidental pollution of water tank.
Impact on human health and swimming skills
Swimming pool water is not standard is considered god for human health.  Unpolluted pools will be the habitat for many species of bacteria such as Cryptosporidium – the main cause of human diarrhea or Chlamydia Trachomatis – the culprit of conjunctivitis in the eye. 
In contrast, swimming pools containing too many disinfectants irritate the skin, eyes because the concentration of chlorine is too large, the pH is low.
In particular, chlorine used in large amounts can be very dangerous for swimmers. US scientists have conducted experiments to collect water in public swimming pools and tap water to determine the level of genotoxicity (the process of DNA mutation). 
The results showed that the excess chlorine in the swimming pool had an effect on DNA that was superior to tap water. In addition, in indoor swimming pools, excess chlorine in water can not escape, easily irritating the respiratory system of swimmers if inhaled too much.
In order to swim safely, you should  pay attention to observe the swimming pool  you are going to. If that tank has the right amount of water , the  water while looking at the naked eye and no smell, that is the swimming pool can use . Conversely, if swimming pools are cloudy or chlorine-specific shock, the number of swimmers should consider whether to continue swimming or not.
Also, in any pool, you should also  shower before entering the tank to limit sweat, cosmetics … on the body  – potential substances that pollute the swimming pool. At the same time, you need to use swimming glasses tight, avoid water penetration into the eyes, as well as cleansing the body with eye drops, earrings after swimming to avoid infection of diarrhea, conjunctivitis …

Another small note is that you  should not urinate under the swimming pool . Recent research has shown that compounds found in urine combined with chlorine can cause many adverse health effects such as genetic damage, asthma, cancer.

To swim safely, you can self-identify and assess the status of swimming pool in a number of ways as follows:

– Smell: If the swimming pool has a characteristic chlorine smell, which makes you feel uncomfortable when smelling, it means that the water in the tank has not been treated well.

– Water color: water color in nature, clear bottom of the tank, moderate in color, no turbidity or strange objects. If the tank is unusually blue (note the color of the sky), it should be noted.

– Observation of the number of people to swim: humans are also one of the factors that cause swimming pool “poison”. If this amount is too high, the water filter in the tank will not be able to filter up to remove the toxin.

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