Water is the natural environment for almost all living organisms. Water is loved not only by people, but also by bacteria, algae and fungi. The pool is constantly polluted with street debris and dust (when placed on the street or with open panoramic windows), microorganisms that enter through the ventilation of the covered complex. Dirt from the feet, particles of dead skin, cosmetic preparations get into the water, which turns the bowl into an environment for the growth of pathogens. A whitish coating forms on the walls, the water becomes cloudy and green, it smells unpleasant.

Pools need to be cleaned regularly, but mechanical maintenance and filtration alone will not solve the problem. It is necessary to disinfect water, suppress the growth of algae, the reproduction of bacteria, eliminate the waste products of microorganisms, and remove the smallest polluting flakes. It will not be possible to do without special chemistry. Only reagents, disinfecting, purifying and disinfecting water at a “thin level”, will make it safe for bathers, transparent and clean. Today, chemicals in various forms are the most popular, effective and easy-to-use way to care for pools.

 Water treatment stages

In order for the water bowl to become clean, and it was safe to swim in it, you need to take a comprehensive approach to caring for it. A set of chemical reagents is selected individually, taking into account the purpose, volume, number of bathers, climate, type of filters and other factors. Cleaning is carried out in stages.

Need to:

  • clean the pool – drain the water, remove salt, mineral deposits, plaque, treat the steel elements with special means;
  • fill the bowl and treat the water with disinfectants so that all microorganisms die – in the vast majority of cases, reagents based on chlorine or active oxygen are used for this;
  • equalize the pH level of water;
  • suppress algae growth with algaecides;
  • to make water transparent – coagulants and flocculants are used for this.

When preparing the pool for winter conservation, experts and experienced owners do not recommend draining the water. There is a risk that due to changes in the level of freezing and thawing soils, the load on the walls will increase dangerously. Therefore, water is left in the bowl, which “resists” pressure, serves as a natural heat insulator. Preservative substances are added to it, which inhibit the growth of fungi, algae and bacteria and greatly simplify the preparation of the bowl for use in the warm period.

The principle of action of chemicals

All funds for pools are conditionally divided into several categories. The first is reagents that destroy pathogenic flora, which the filtration system cannot cope with. The compounds turn water into a bactericidal solution, harmless to people (even small children), but deadly to microorganisms. Better than others, chlorides cope with the task, they kill harmful bacteria, oxygen reagents block the reproduction of bacteria. They remain active in water longer than others and destroy most of the microorganisms.

The pH level is measured with special testers or test strips, and to equalize it, compounds are used that increase or decrease the indicator. Algaecidal reagents prevent the growth of algae and destroy existing ones. They fight against the “bloom” of water, do not give foam and odor, are dosed directly into the filled pool. To remove contaminants, to make the water transparent, coagulating reagents are used. One of their varieties – flocculants – absorbs the smallest contaminants, collecting them into large “flakes”. They are then simply removed with a net or a special vacuum cleaner.

In some cases, the means are used:

  • regulating water hardness in the pool;
  • preventing the appearance of foam;
  • cleaning the bowl, metal parts – inorganic acids to remove mineral salt deposits, alkalis to combat plaque on the waterline, special tools for steel, and so on.

A separate group of reagents is compositions for complex cleaning. They contain substances that perform all functions. For complete confidence in the safety and purity of water, it is still worth separating the stages in order to correctly combine chemical reagents with mechanical actions.

Compositions for disinfection

Disinfecting water, especially in a public pool, should be done regularly. Pathogenic microflora is the cause of the spread of infectious diseases, including extremely dangerous ones. Until recently, disinfection among users was firmly associated with the pungent smell of “chlorine” – disinfection was carried out with a gaseous form of chlorine, toxic, causing pain in the eyes and irritating the respiratory system. Modern preparations for water purification are harmless, almost unnoticed by swimmers and effectively “work” if they are dosed correctly.

Chlorine and chlorides

Chlorine-based reagents remain the most affordable, effective and simple disinfectant. Available in tablets, granules, liquid form for dispensers. Chlorine in them is present only in bound form – it is sodium hypochlorite or chlorine isocyanurate. In water, the components are released, their most powerful bactericidal action is activated.

The optimal concentration of the substance is up to 0.4 mg / l. If you “save” on the reagent, due to the lack of released chlorine, the oxidation cycle will not complete, a pungent odor will appear in the pool, and swimmers will feel pain in the eyes, and irritation will appear on the skin. In this case, it will be necessary to carry out “shock” chlorination at night, when there will be no people.

active oxygen

If the water bowl is used privately, is located indoors, it is permissible to use mild chlorine-free compounds for cleaning. Their active component is active oxygen (or rather, its radicals). It is weaker than chlorine, so it is not used for large, open public complexes. However, for personal use with chlorine intolerance, this is an excellent solution. Reagent:

  • does not change the pH in the pool;
  • does not irritate the skin, mucous membranes, does not worsen the condition of the hair;
  • can be used in parallel with chlorination;
  • inhibits the growth of algae, slightly lowers the pH of the water.

Other reagents

Chemistry for measuring and correcting pH

Checking and balancing the pH is a mandatory step in cleaning the pool. The indicator determines how active oxygen ions are, what acidity or alkalinity is in an aqueous solution. The optimal “fork” for the indicator is from 7.2 to 7.6. If the parameter is less than normal, due to the acidic environment, the metal parts of the pool deteriorate and the skin of swimmers is irritated. Exceeding the indicator by 0.2 points leads to damage to the mucous membranes, and if it increases to 9, disinfection will become ineffective, the water will become cloudy, and plaque will appear on the walls of the bowl.

In public places, analysis should be done every 4 hours, in private places at least once a week. With a low pH, increasing compounds are used (for example, reagents based on hydrogen carbonate salts), with an increased pH-minus option is needed – sodium bisulfate, sodium hydrosulfate in the form of liquids or powders. Funds of the first type, as a rule, are required less frequently than the second.

What stops algae growth

Owners of pools on the street or indoors with large windows are constantly faced with the problem of reproduction of the smallest algae. Because of them, the water becomes greenish, brown, whitish foam appears on it, an unpleasant film, and the walls of the bowl become covered with bloom. Therefore, the use of algicides based on quaternary ammonium compounds or other substances is an obligatory part of cleaning, even if signs of “blooming” are not visible. Preparations are usually combined with disinfectants. The substance is added to water, strictly observing safety measures and following the instructions. It is advisable to choose a composition that does not form foam.

If noticeable ribbon algae appear in the water, they are dealt with with “ambulance” reagents for ponds (an example of a qualitative composition is Fadenalgen-Soforthilfe CHEMOFORM). It is necessary to remove as much mass as possible from the water, and then treat the affected area with the composition. Substances for “ambulance” do not destroy the cause of algae, so they will not replace regular cleansing.

How to deal with cloudy water

The water in the pool becomes cloudy due to the smallest particles that the filters cannot hold. Special coagulating substances “glue” microscopic impurities into large flakes visible to the naked eye. The reagents clarify the water, turn small particles into litter, which is retained by the filter and easily removed from the bottom with a water vacuum cleaner. There are also special tools that, in parallel with the cleansing of debris, give an aesthetic effect. They make the water “crystal”, beautiful and very transparent.

What reagents should be chosen for water purification

Due to the abundance of names and brands of manufacturers, users are lost and cannot find the right reagents. Therefore, here are some examples of useful, effective and easy-to-use formulations for purifying water and bowls.

List of the most common and used chemistry for private and public pools

Chemistry hth (HTH – Arch Water Products)

  • pool chlorine;
  • pool chlorine tablets;
  • aromatic products for SPA and baths;
  • powder pH minus;
  • algicide;
  • crystal water 3 in 1;
  • pool chlorine tablets;
  • complete treatment of water in the pool;
  • rapid tests to determine the parameters of the water in the pool.

Propool liquid chemicals for automatic dosing stations for chemical reagents in the poolPropool Liquid chlorine in cans 25 kg

  • Propool OXY Super liquid with algcid in 25 kg cans;
  • Propool pH minus liquid in 25 kg cans;
  • Propool Coagulant (flocculating agent) liquid in 25 kg cans;

Russian-made liquid chemicals

  • Liquid chlorine in cans;
  • Means for lowering the pH of water;
  • flocculating agent (coagulant, flocculant);

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