Principle of sand cylinder filtration

Sand tank generally placed a certain size of quartz sand, quartz sand in a certain range of sizes and specifications are different, in the sand tank, quartz sand from top to bottom, from small to large in accordance with this arrangement, normal filtering, water from the sand into the upper layer, from the bottom out.

When the water from flowing through the filter layer, the water of solid suspended material in the upper filter material to form a small empty eyes by adsorption and mechanical resistance by filter material surface layer intercept, at the same time, and overlap between the interception of suspended solids and bridging role, as if in form a thin film on the surface of the filter layer, continue to filter the water suspended material, this is known as filter material surface layer of membrane filtration.

This filtration effect is not only on the surface of the filter layer, but also on the interception when water enters the intermediate filter layer. In order to distinguish from the filtration of the surface layer, this effect is called osmotic filtration.

In addition, because the sand particles are closely aligned with each other, suspended particles in the water will have more opportunities to collide and contact with the filter material surface as they flow through the curved channels in the sand layer. As a result, the suspended particles in the water will bond with the flocs on the surface of the sand layer and the contact coagulation process will occur.

To sum up, the sand cylinder filtration is through the membrane filtration, percolation filtration and contact filtration process, so that the water is further purified.

What is the role of circulating filtration in the water purification process of swimming pool?

Swimming pool water after coagulation, sedimentation and pool, has made the water part of the larger settlement of solid particles or easy to remove impurities, to further make the purified water, must use filtering method, after the water through the sand filter layer, will be trapped and fine particles of impurities in water, making water further purification, reduce the turbidity of water again.

Filtration can also make the organic substances, bacteria and viruses in the water be removed in large quantities with the decrease of turbidity, and create good conditions for disinfection after filtration. Because the bacteria in the water lose the protection and dependence of turbidity and present bare forms, it is conducive to sterilization.

Why should the filter sand cylinder be backwashed?What should be paid attention to in back flushing?

In the cycle process of sand filter tank, because the sand layer intercepts the suspended matter in the water, when the suspended matter reaches a certain amount, it will affect the filtration speed and quality, especially when adding coagulant in front of the sand tank, it is more important to master the recosting time. Backwash is used to remove the suspended solids trapped in the sand cylinder, in order to restore the filtration capacity of the sand cylinder, backwash must master the speed and time of backwash, such as using quartz sand as filter material, backwash intensity should not be less than 15L/ (S.m. 2), backwash time 5~6mim or observe the backwash out.

Sand filter cylinder recommended!

Founded in 2017, Jiangmen Tuowai Mechanical and Electrical Equipment Co., Ltd. is an enterprise specializing in the design and manufacture of swimming pool equipment such as water pumps and sand filter cylinders in Jiangmen, Guangdong.The product design concept originates from the classic original products of the United States.

Since the 1990s, the products have been popular in more than 30 countries and regions, such as The United Kingdom, Spain, France, Germany, the United States, Dubai, Thailand and South Korea.

Through our continuous improvement of good quality, at home and abroad have been in short supply of the good market, won a large number of domestic and foreign sellers all favor and approval.Because focus, so professional.Welcome new and old customers to consult or understand!