With the rapid development of swimming pools, and various demands for swimming pool sand tanks. Sand cylinders also exist in various styles, materials, internal structures, and performances. At present, from the appearance of swimming pool sand tanks, it can be divided into: vertical top discharge sand tank, vertical side discharge sand tank, horizontal sand tank, high-efficiency deep sand tank, etc.
According to the material, it can be divided into: glass fiber sand cylinder, polyethylene sand cylinder, anti-ultraviolet plastic sand cylinder, resin sand cylinder, stainless steel sand cylinder. Each type of sand tank will be selected according to the conditions of the swimming pool machine room, water temperature, and the customer's own conditions. The sand tank uses special filter sand to eliminate the tiny dirt in the pool water.
Filter sand is used as a medium for removing dirt and is packed in the cavity of the filter. The pool water passes through the filter, and the microscopic dirt is captured and filtered out by the sand bed. The filtered clean water passes through the control switch at the bottom of the filter and returns to the pool through the pipeline.
This entire process is continuous and automatic and provides a complete cycle for the filter and piping system. A certain scale of quartz sand is generally placed in the sand tank of the swimming pool. During normal filtration, the water enters from the upper layer of the sand and comes out from the lower layer. During the circulation process of the swimming pool sand 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. At this time, we need to understand the knowledge of backwashing.
Backwashing is used to remove suspended solids trapped in the sand tank to restore the filter capacity of the sand tank. Backwashing must master the speed and time of backwashing. If quartz sand is used as the filter material, the backwashing intensity should not be lower than 15L/( S.m2), the backwashing time is 5~6mim or until there is no suspended matter in the backwashed water. The backwashing of the sand tank is to use water or air water to send into the filter from the opposite direction of the filtered water, so that the filter material layer is loosened, so as to remove the dirt intercepted on the surface of the filter material layer, so as to restore the filter performance of the filter , to ensure the filtration effect, the amount of circulating water and reduce the energy consumption of circulating water pumps. Practice has proved that when the diameter of the filter is less than 1600mm, the application effect of backwashing is better.
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