Swimming pool water treatment filtration system selection

  Cloudy swimming pool water not only affects water quality but also easily causes safety accidents, reduces disinfection effectiveness, and directly impacts swimmers' comfort. Water purification can be said to be the core of swimming pool water treatment. Currently, the commonly used filtration systems in the swimming pool water treatment industry are mainly based on quartz sand pressure filtration and diatomaceous earth pressure filtration, as well as relatively smaller wall-mounted integrated filters and gravity filters.

Introduction to Four Filtration Methods

  1. Introduction to Quartz Sand Filtration Process

  Quartz sand filter materials generally use high-quality carbon steel lined rubber anti-corrosion stainless steel and reinforced fiberglass materials, which must be resistant to both ozone and chloride ion corrosion. Design Pressure 0.6MPa. An automatic air vent is installed on the top of the equipment to promptly discharge air sucked in due to improper operation. There are holes in the middle or top of the tank to facilitate access and replacement or filling of filter materials. The quartz sand filter should use 0.45-0.8mm refined quartz natural sea sand filter material, and the bottom of the cylinder should be equipped with a pebble (particle size 2mm-32mm) support layer. To achieve deep filtration, the effective filtration layer thickness should not be less than 700mm, and a 4-5 meter water head is required. Considering the scaling of filter materials during the filtration process, which leads to increased pressure, the cylinder's pressure resistance capacity must be greater than 0.6MPa. The tank is equipped with a sight glass, and a low-voltage waterproof lamp can be installed if necessary to observe the dirt condition inside the sand box.

  2. Introduction to Diatomaceous Earth Filtration Process

  Pressure diatomaceous earth filters can be divided into plate and frame types and candle types. Plate and frame diatomaceous earth filters consist of multiple filter units, each unit consisting of a filter plate, frame, and filter cloth. The filter cloth is sandwiched between the plates and frames as the filter medium.

  The shape of the candle-type diatomaceous earth filter is similar to a vertical quartz sand pressure filter, and the inside is composed of candle-shaped filter elements. During filtration, a diatomaceous earth pre-coating is first formed on the filter candle. When the material passes through the diatomaceous earth filter layer attached to the surface of the filter candle column, it intercepts suspended matter and colloidal particles to achieve the filtration purpose.

  Diatomaceous earth filter material is a siliceous biogenic sedimentary rock with opal as its main mineral component, mainly formed by the deposition of the remains of single-celled aquatic plants, diatoms. It has the characteristics of being porous, having a large surface area, and good chemical stability, and is a natural filter aid. In addition, diatomaceous earth also has unique ion selectivity and the ability to kill chlorine-resistant pathogens. After using the diatomaceous earth filter for a period of time, more and more impurities will accumulate on the pre-coating layer, blocking the filtration channels. Therefore, a certain amount of diatomaceous earth needs to be added, so that the diatomaceous earth and the suspended solids in the filtrate are intercepted and adsorbed by the filter screen together, forming a new filter layer to prevent the microfiltration pores from being completely blocked, maintaining filtration performance, extending the filtration cycle, and increasing the total amount of single filtration.

  3. Introduction to Wall-Mounted Integrated Filtration Process

  Wall-mounted integrated filters generally use high-quality paper core filter cartridges or PP filter cartridges as the filter medium, and are equipped with built-in circulating water pumps, automatic dosing devices, underwater lights, etc. Its circulation method is suction type, sucking from the equipment's own suction port, and discharging after filtration and purification from the water supply port. Its service range is limited to a limited area around the equipment, and there may be dead corners and eddy current problems during use. It is not a mainstream filtration process, and its market usage rate is low. It is only suitable for pools without machine rooms, small water volume, and few swimmers, such as high-end villa outdoor pools and private club pools.

  4. Introduction to Gravity Filter Process

  Gravity filters are most suitable for improving natural or artificial landscape water bodies. Their aeration and oxygenation function can activate the water body, and sand bed filtration helps to remove organic pollutants from the water body and reduce turbidity. This is a water treatment process in the field of environmental microbiology. The water treatment of swimming and recreational water is a medical disinfection process of medical microbial disinfection and sterilization, and there is an essential difference between the two. Gravity filtration technology was initially applied to the treatment of natural or artificial landscape water bodies. In the past ten years, there have also been application cases of gravity filtration systems in the treatment of recreational water such as swimming pools and water parks in China, but the overall market share is low.

  The process of a gravity filter is as follows: the raw water is sent to the water distribution tank for even distribution, then undergoes aeration and oxygenation through an air isolation device (removing harmful gases such as nitrogen, phosphorus, and potassium from the water, and inhaling oxygen; this system is also called a respiratory system), and then enters the fine filter (composed of multiple layers of filter materials) for top-down filtration. Due to the continuous interception of suspended matter by the filter layer, the resistance increases, and the siphon tube water level rises. When the water level rises to the set position, the air extraction device in the siphon auxiliary pipe is activated, and the hydraulic action removes the air in the siphon pipe, forming a negative pressure. When the negative pressure reaches the design value, a siphon phenomenon occurs, and the water in the water tank flows back, flushing from the bottom up from the bottom of the filter layer. The filter layer is regenerated, and the wastewater is discharged into the sewer. When the water level in the water tank drops to the specified value, the siphon action is destroyed, the backwashing ends, and the filter starts working again.

Guangzhou Huidi Is not only a professional swimming pool equipment supplier, but also a professional hot spring engineering design, planning, and construction integrated service provider, Committed to "Quality First", always providing customers with the best quality service.

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