How to choose the right swimming pool sand filter equipment?

In order to ensure the quality of the swimming pool and maintain its normal operation, selecting appropriate equipment is crucial. The swimming pool sand filter is one of the core components in the water treatment system, directly influencing water quality clarification and the normal operation of the swimming pool equipment. Therefore, swimming pool owners and managers should correctly select swimming pool sand filter equipment to ensure clear swimming pool water quality and a comfortable environment.

The quartz sand filter is currently the most widely used water treatment device, categorized into pressure filters and quartz sand vacuum negative pressure filters. Among these, quartz sand pressure filters have held an important position in the development of the past ten years and have brought many advantages to the field of water treatment.

Widely known for their traditional technology and water quality stability, quartz sand pressure filters are easy to operate, have low maintenance costs, and require a small machine room height. This equipment is highly suitable for various water treatment systems, particularly for public swimming pools and water pools, as they can flexibly adapt to a wide range of load changes.

This filter not only has significant economic advantages but also reduces equipment investment costs. At the same time, due to its advantages such as easy maintenance and longevity, it has become the mainstream in the field of water treatment.

pool sand filters

I. Working principle of quartz sand

Physical filtration process

Quartz sand is used as filter media to fill the inner cavity of the filter. Under a certain water pressure, the water pump enters the filter, and through the filtration effect of the quartz sand layer, high turbidity impurities, floating objects, colloidal particles, etc., are retained in the quartz sand layer. This filter allows water to flow through a layer of quartz sand while also effectively blocking contaminants.

Water recycling

After being filtered, the water will return to the pool for the next cycle, usually involving heating and sterilization. This recycling method can keep the water quality clear and clean and can effectively treat pollutants in sewage.

Filter replacement cycle

The quartz sand filter material used in sand tanks generally has a service life of 2 to 3 years and needs to be replaced regularly. When quartz sand is contaminated, it will adhere to its surface, affecting its filtration performance, so it must be cleaned frequently to ensure its normal use.

II. Conditions based on quartz sand filter selection

The selection of quartz sand filters is based on several key conditions, including filtration performance and sand tank size, mainly depending on the circulation cycle of the swimming pool. The cycle period has certain requirements on the filtration speed, and the choice of filtration speed directly affects the performance and operating effect of the sand cylinder.

In general, as the cycle time increases, the requirements for the filtration rate also increase accordingly. However, it is not necessary to use a higher filtration rate; otherwise, too high a filtration rate will reduce the filtration effect. Judging from the actual situation at home and abroad, under normal circumstances, the filtration speed is 10-25 meters/hour. In this interval, filtration efficiency and filtration pressure loss increase with the increase of filtration rate.

However, too fast a filtration rate can cause many problems. The test results show that after the filtration rate is greater than 25 meters/hour, the filtration effect drops sharply, and as the filtration rate increases, the quality of the filtered water continues to decline. Therefore, choosing the right filtration rate is crucial to maintaining good water quality and the proper operation of your sand tank.

From theory to practice, it has been shown that too fast a filtration rate will not only have a negative impact on the quality of filtered water but also shorten the filter operation time, increase the number of backwashes, and increase the amount of backwash water. Therefore, careful selection of the filtration rate is an important factor in ensuring the effective operation of quartz sand filters.

III. Types of quartz sand and usage scenarios

There are three common types of materials for quartz sand filters: plastic quartz sand filters, fiberglass quartz sand filters, and stainless steel quartz sand filters. The following is a detailed description of them and their respective usage scenarios:

Plastic quartz sand filter

Made of food-grade plastic material, it is safe, environmentally friendly, and economical. The material has strong corrosion resistance and impact resistance, making it easy to transport and install. Mainly used in small swimming pools, spa pools, and other projects, especially in small swimming pools. Because it is lightweight, economical, and practical, it is suitable for occasions where there are certain restrictions on the weight and cost of the equipment.

Fiberglass quartz sand filter

Made of fiberglass material, it has high strength and is not easy to deform, crack, or wear. In addition, FRP also has good resistance to chemical attack and UV resistance. This product is mainly used for medium and large swimming pools. This product is durable and resistant to chemical erosion and can be widely used in large swimming pools, water parks, and other occasions that have high requirements for filtration performance and service life.

Stainless steel quartz sand filter

Made of stainless steel, it has high strength and strong corrosion resistance. However, stainless steel is expensive. It is usually used in large swimming pools, especially in situations where equipment requirements, long service life, and high-performance requirements are required. Due to its high cost, this technology is widely used in large sewage treatment plants that have high requirements for equipment quality and stability.

When choosing a swimming pool sand pit, you must consider the size, quantity, and water quality of the pool. Choosing appropriate sand tank equipment can not only improve the water purification effect but also reduce equipment maintenance costs and energy consumption. Through reasonable screening and scientific management, the water quality in the swimming pool is guaranteed to be clean and clear, providing swimming enthusiasts with a safe, healthy, and enjoyable water park.