Outdoor pools when to swim with the least UV rays

Outdoor pools swim after 4 p.m. with minimal UV rays.

A swimming pool is a place where people engage in swimming sports where people can move or compete. Most swimming pools are built on the ground, and according to the water temperature, they can be divided into general swimming pools and heated swimming pools.

A swimming pool is a swimming venue where you can move or compete. Most swimming pools are built on the ground, and according to the water temperature, they can be divided into general swimming pools and heated swimming pools. Swimming pool is a special place for swimming sports.

There are two types: indoor and outdoor. The pool used for official competitions is 50 meters long, at least 21 meters wide, and the water depth is more than one meter; Pools for swimming, diving and water polo combined, water depth meters; The depth of the pool with a 10-metre jumping platform should be 5 metres. The pool water temperature should be maintained at 27-28 ° C.

Filtration and disinfection equipment should be in place to keep the pool water clean.

As a water sport, it is inseparable from the control, monitoring and treatment of swimming pool water quality, which requires good sensory properties of pool water, no pathogenic microorganisms in the water, and no harmful human health of chemicals contained in the water, so as to ensure the safety and reliability of swimming pool water quality. The implementation of the "swimming pool water quality standard" (CJ 244-2007) will play an important role in the health management of swimming places in China, prevent the spread of diseases and protect the health and safety of swimming pool users, and at the same time provide technical guarantee for the water quality standards of various international swimming competitions held in China in the future, so that China's swimming pool water quality standards are in line with developed countries, and have a very positive effect on the smooth holding of the Beijing Olympic Games.

In this standard, the following main principles are followed, especially for the determination of water quality index items should have sufficient basic information, with feasible testing methods, water quality limits should ensure that the water quality is good, prevent the outbreak of waterborne infectious diseases and other health risks, and should also consider other treatment technologies and laboratory testing costs, which are in line with China's national conditions and operable.

Swimming pool water is relatively a kind of reclaimed water that is easy to treat, and the water treatment of swimming pool is divided into two parts, namely circulating water treatment of swimming pool and overflow reuse water treatment.

Generally, the following process flow is adopted. For the original swimming pool circulating water, it is treated with disinfectant after direct filtration, and the disinfectant is sodium hypochlorite disinfectant, which is prepared and provided by the sodium hypochlorite generator on site. As for swimming pool overflow, as long as there are no defects in the design of the circulating pipes, the waste of water caused by system defects is avoided, so that there is only overflow water within the normal range.

For the normal swimming pool overflow, if you want to deal with it, it will be coagulation treatment first, then filtered, the swimming pool circulating water pump, and then disinfected with pesticides, and finally enter the swimming pool. The filter material of the main circulation filter tank is generally made of quartz sand, which has a long life and a good effect on filtering algae.

Just swim normally, and if you don't go into the water for a long time after going ashore, you can apply sunscreen if the local ultraviolet rays are too strong.

It is best in the morning when the sun is not yet out.

After 4 p.m., the water is warm and the ultraviolet rays are not strong.

The so-called water absorbs very little ultraviolet rays, mainly infrared and visible light, just do a good job of sun protection.

If you are really afraid of the dark, you have to swim in the morning, but the water is relatively cold in the morning, which is not very good for the girl's body.

It is usually between 6 and 8 in the morning and between 5 and 6 in the evening.

Then when it's cloudy, it's about the same as when it's sunny.

Don't be at noon.

The morning in summer is better, the morning sun is much milder than the afternoon, avoiding the impact of strong ultraviolet radiation in summer, the swimming pool in the morning is generally less crowded, and the water quality is slightly better after the disinfection of the staff the night before.

Be sure to warm up well before swimming to avoid cramps.

Around 10 p.m. and around 5 p.m., this time is the best time of the day, so swimming is also more suitable, the air is fresh, the mood is good, and the breathing is better.

Except in the middle of the day when the sun is too hot, in the morning and after 4 o'clock in the afternoon.

In fact, winter and summer are good!! It depends on personal preference.

1 The life of the ultraviolet germicidal lamp when it is continuously lit is about 7000 8000 hours, when the number of hours is accumulated, the output of the germicidal lamp is reduced to 65 70% of the initial stage due to the deterioration of time, and the germicidal lamp must be replaced regularly in order to improve economic efficiency and maintain good sterilization. 2.When the water quality of the swimming pool is unbalanced, there will be scaling, which is present on the quartz casing, which will shade part of the irradiated area and affect the effect, so it is necessary to regularly inspect the surface of the quartz casing, and similarly, if the quartz casing is aging, it will also affect the penetration of ultraviolet rays.

3.When the pool water is turbid, it will hinder the penetration of ultraviolet rays, resulting in poor sterilization effect, so it is necessary to strengthen the supplement of other agents when the pool water has poor visibility or color.

4.Ultraviolet disinfection and sterilization is an instantaneous type, there is no residual existence, therefore, the water is sterile after flowing through the germicidal lamp, but there is no way to resist re-pollution, compared to ozone, its half-life is zero, therefore, ultraviolet light can not be used as a swimming pool or jacuzzi disinfection disinfectant, it must be used with other residual agents. Under ultraviolet radiation, chlorine, bromine, ozone and other disinfectants and disinfectants will be destroyed, so the use of disinfectants and disinfectants will increase.