Water quality management of small swimming pool
Water quality management of small swimming pool
Most of the small swimming pools are household type, and the key content of their daily maintenance work is water quality management, that is to maintain the water quality effectively. In theory, the water quality of small domestic swimming pool should meet the national standard of water quality for artificial swimming pool, just like that of large public swimming pool. However, due to family conditions, it is difficult to carry out comprehensive water quality monitoring, so we should master certain professional knowledge.
1. Control bacterial and virus pollution
In order to control the harmful bacteria and virus pollution, it is necessary to add disinfectant in the pool water. For household users, the most commonly used disinfectants are bromine and its compounds, chlorine and its compounds.
Under special circumstances, excessive sodium hypochlorite or calcium hypochlorite can be added to the pool water at a time to form a higher chlorine concentration, inhibit the growth of algae and reduce the unpleasant smell of chloroform, and also destroy the organic pollutants gathered together. In addition, the chlorine concentration in the pool water can reach about 10 mg / L by introducing excessive chlorine gas at one time, which can effectively prevent the growth of bacteria and algae. Such treatment can be carried out once a week in the family pool.
2. Prevent the growth and propagation of algae
Algae are very small plants, there are hundreds of different types. Algae can breed rapidly in the water. Firstly, it will consume the dissolved carbon dioxide in the water, leading to the rapid rise of pH. then, as the dead algae consume the oxygen in the water, the clear pool water will become a jar of dead water in a day. Spores in the air, turf and soil scour into the water body will bring algae, which often happens after rainstorm, especially when the water temperature is high.
Generally, when there is enough residual chlorine in the water, algal propagation can be effectively inhibited. The special algaecide crystal copper sulfate is very soluble in water, which can inhibit the growth of algae and make the water blue. It is worth mentioning that you should not bathe in the family swimming pool to avoid serious pollution of water quality.
3. Adjust the hardness of water
Hard water means that the concentration of calcium ion in the water is more than 250 mg / L and the alkalinity is more than 150 mg / L. The pH in hard water is relatively stable, but the way to improve the hardness of water should not be taken to stabilize the pH. For the hard water source, a softener shall be set at the make-up port for pretreatment.
The calcium carbonate concentration of soft water is less than 50 mg / L or the calcium chloride concentration is less than 30 mg / L. PH in soft water is difficult to keep stable. Calcium hypochlorite is used as disinfectant to improve the hardness of water.
The hardness of the water should be moderate. If it is too high, it will appear aggregates on the pool wall. If it is too low, it will erode the mortar on the pool wall.
4. Keep the pool water transparent and clean
The total amount of soluble solids (TDS) can be used to reflect the transparency and cleanness of water. TDS refers to the chemicals with electric charge that will gather in the pool water, especially when the pool water evaporates or does not add enough fresh make-up water. This kind of material is hard to see by the naked eye, but because of its conductivity, it will corrode all parts of the pool, such as pumps, pipes, filters, etc. These substances usually exist in the form of chlorides or sulfates: the long-term use of sodium hypochlorite as a disinfectant will lead to the accumulation of chlorides; the regular addition of substances such as aluminum sulfate and sodium bisulfate will lead to the increase of sulfate concentration. The best way to control TDS is to backwash periodically and replenish fresh water in time.
5. PH value of stabilization tank water
The pH reflects the concentration of H + or Oh - in the pool water, and the range of pH in the pool water specified in the water quality standard for artificial swimming pool is 6.5-8.5. In order to protect the reasonable operation of the swimming pool, the users of the swimming pool should pay close attention to whether the index is up to the standard. The pH of the water can be measured by simple test paper. In order to stabilize the pH of the pool water, a special stabilizer should be added to keep the pH of the pool water in a reasonable range.
At the same time, pay attention to another index closely related to pH: total alkalinity. The total alkalinity reflects the difficulty of pH change. If the total alkalinity is lower than 80 mg / L, the stability of pH is not enough and easy to fluctuate; if the total alkalinity is higher than 200 mg / L, the stability of pH is too high to be adjusted. The pH value of the pool water should have reasonable stability, which can be adjusted without excessive fluctuation, so the total alkalinity should be kept in a reasonable range. In addition, high alkalinity and high pH will cause water turbidity and sediment formation; low alkalinity will cause equipment corrosion and cause swimmer discomfort.
The small swimming pool has a complete water treatment system, that is, it is equipped with filtration, disinfection, pool bottom cleaning and other facilities. The key of daily maintenance of family swimming pool is reasonable water quality management. It is an effective way for users to master certain professional knowledge and pay close attention to important water quality indicators.