A certain scale of quartz sand is generally placed in the swimming pool filter sand tank. The size and specification of the quartz sand are different within a certain range. In the sand tank, the quartz sand is arranged from top to bottom, from small to large. During normal filtration, the water is Enter from the upper layer of sand and come out from the lower layer. When water flows through the filter layer from above, part of the solid suspended matter in the water enters the tiny holes formed by the upper filter material and is trapped by the surface layer of the filter material due to adsorption and mechanical retention. At the same time, the suspended matter between these trapped Overlapping and bridging occurs again, as if a thin film is formed on the surface of the filter layer, which continues to filter the suspended matter in the water, which is the so-called membrane filtration of the surface layer of the filter material. This kind of filtering effect is not only on the surface of the filter layer, but also has this interception effect when water enters the middle filter layer. In order to distinguish it from the filtration of the surface layer, this effect is called osmotic filtration.
In addition, because the sand particles are closely arranged with each other, when the suspended particles in the water flow through the tortuous channels in the sand layer, there will be more opportunities and time to collide and contact with the surface of the filter material. The suspended solids in the sand layer bond with the flocs on the particle surface of the sand layer to form a contact coagulation process. To sum up, the filtration of swimming pool filter sand tank is to further purify the water through the process of membrane filtration, osmosis filtration and contact filtration. Generally, the service life of the sand in the sand tank of the swimming pool is 1 to 2 years.
The replacement of swimming pool sand is one of the key points of swimming pool sand tank maintenance. Regular replacement of sand tank sand can not only prolong the service life of the sand tank, but also improve the water quality of the swimming pool and the smoothness of the pipeline. Reason: The main function of the sand tank used in the swimming pool is to filter, and the quartz sand is the main filter material of the sand tank, so the quality of the quartz sand directly determines the filtering effect of the sand tank. The shape of the quartz sand used for sand tank filtration is a regular hexahedron with eight corners. When the quartz sand is stacked in the sand tank, there will be gaps between the corners of each quartz sand and the corners.
These gaps allow water to pass through smoothly, but impurities larger than the gaps cannot pass through, so that it can play a purifying role. The size of the gap determines the filtration accuracy of the sand tank. When the gap is small, the filtration accuracy is higher, but if the gap is too small, the water output of the entire sand layer will be reduced, thereby affecting the water output of the sand tank. Therefore, the gap between the quartz sand determines the filtering effect, and the size of the quartz sand and the integrity of the quartz sand directly determine the size of the quartz sand gap.
Therefore, it can be known that the size of the British sand and the integrity of the quartz sand are the most important factors for the filtration of the sand tank. Guangdong Boying Environmental Protection Equipment Co., Ltd. provides the most complete hot spring spa equipment, hot spring equipment, sauna equipment, swimming pool equipment, swimming pool equipment, reliable quality, professional construction, affordable price, welcome friends to come to consult, hotline: 135-7010- 6925 Poolking is the best swimming pool equipment manufacturer and supplier in China. Poolking exists to provide the highest quality swimming pool equipment while offering competitive pricing..