Pool sand filter is also known as filter sand tank, sand tank filter, sand filter tank, etc. Named for the original use of quartz sand as a filter material. With the continuous improvement of people’s living standards, swimming has gradually become a sport suitable for all ages. However, at the context of global water shortages, if the water in the pool can not be recycled, it will result in significant waste. Consequently, with the support of national policies, many natatoriums have established independent water circulation systems, and in the construction of the water circulation system, sewage filtration is naturally the focus that cannot be ignored. In this context, the pool sand filter began to “enter” people’s lives, and became the “hero” of the major natatorium to achieve water resource recycling. Here we introduce the common filter materials in the pool sand filter.
Quartz sand
If the purpose of swimming pool water treatment is to filter out large particles of suspended matter in the water, pure white quartz sand is generally used. Its main component is silica. Quartz sand is difficult to react with acid and base, and its chemical properties are stable. It has a small filter coefficient, and the material is both convenient to use and inexpensive. It is the main filter material of pool sand filter.
Quartz sand specification for sewage treatment
No. 3 sand,with a diameter 2-4mm, is generally used to filter large particles of impurities, such as the primary filtration of circulating water shrimp, the first to filter out the large particles of shrimp shells, in order to carry out the next step of water treatment. At this time, No. 3 sand can be used;
No. 4 sand with a diameter of 1-2mm is mostly used for filtering larger particles, such as adult green algae in swimming pool water;
No.5 sand has a diameter of 0.5-1.5mm and is mostly used for filtering smaller particles. Such as secondary filtration in the factory farming filtration system, swimming pool water treatment and so on. Filter out most of the solid particles such as fish feces, food, hair, etc.
No. 6 sand diameter 0.2-0.5mm, generally used for fine filtration, such as the primary filtration of drinking water.
What is the effect of quartz sand on filtering pool water?
Since it is a pool sand filter, the “filtration” effect is naturally the focus that cannot be ignored. After all, only the filter is clean, in order to bring people a better swimming experience, different from other filters on the market, the pool sand filter uses quartz sand as the filter medium, it can effectively trap the sand, rust, red worms, fiber hair, glial particles, and many other particles under a certain pressure, the filtration accuracy can reach 5μm, So that every drop of water entering the pool sand filter can be clean and transparent when it is discharged again, without any impurities, and providing swimmers with a “clear and pure” pool. At the same time, in order to meet the different filtration needs of different venues, the swimming pool equipment has designed its pool sand filter for different sizes, which can achieve a maximum filtration flow of 350m³/h, whether it is a hotel pool, a villa pool or a swimming pool.
Activated carbon
Activated carbon,with its strong physical and chemical adsorption, can absorb colored substances in water, some salts, ozone, and even bacteria. Activated carbon is divided into wood carbon and coal carbon. Its effectiveness is superior to that of wood carbon. The adsorbability of activated carbon varies according to different materials and manufacturing processes, and the iodine value is taken as a standard to evaluate its merits. Generally, the iodine value of more than 850 is high-quality activated carbon. The disadvantage of activated carbon is that it needs to be replaced in time after it reaches saturation adsorption.
Biochemical filter material
Typical biochemical filter materials are volcanic stone, brush, porous ceramic rings. Biochemical filter material as a carrier of biochemical bacteria, the general water flow is slow. The flexible backwash function of the sand tank can easily wash away the dirt trapped by the biochemical filter material. The use of a glass fiber winding structure on the outside of the pool sand filter not only provides strong chemical corrosion resistance but also ensures substantial pressure resistance, effectively extending the service life of the pool sand filter, and avoiding the trouble of frequent replacement. With the biochemical filter material, the filtration effect of the pool sand filter is obvious.
Conclusion
Because the pool sand filter has the advantages of lightweight, simple operation and low cost, it is more and more applied in various water treatment industries. The filter material matching with it is also different because of the different role of the pool sand filter.
