What does a sand filter do, and how does it work?

The sand filter is currently one of the most used and common pool water purification equipment. Water purification of swimming pools is done in different ways, including using a sand filter. The pool sand filter physically separates suspended water particles such as hydrocarbons, sand, metals, sediments, and other harmful substances from the water and purifies the water, and finally, this purified water enters the pool bowl or jacuzzi and is used. Users are placed. The following article answers the question, what is the structure of the sand filter?

What is a sand filter?

The first factor that can be considered for swimming in the pool is the level of transparency of the pool water, and these are the pool water filters that make the pool water physically and visually clean. One of the most widely used types of filtration filters is a sand filter.
This filter is responsible for removing insoluble and suspended particles in water such as dust, dirt, etc. The sand filter, containing silica and granulated sand, prevents the passage of physical pollution and suspended particles in the water. Only water can pass through this part, and, sand filters, like sand filters under pressure, perform water clarification and purification.

What are the components of a sand filter?

The sand filter together with the pool filtration pump performs the work of circulating and purifying the pool water. The sand filter shows an effective performance in reducing water pollution, including bacteria and floating or suspended fats caused by swimmers' bodies in the pool water. In the following, we intend to introduce the most important components of pool sand filters, which consist of a metal or fiberglass cylindrical body in different dimensions and sizes (based on the capacity of the filter and the pool) along with some granulated sand or silica inside it. The pipe and valves are on the body, let's pay.

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Sand filter body

First, it is better to address the issue of the sand filter body. The volume and material of the body of each sand filter may be different from each other, and its construction is made of metal, etc. Of course, polyester reinforced with fiberglass (FRP filter) will be more durable and efficient among all these materials.

Filter valve

Most sand filters have a valve in their upper part, which will be used to control the flow of water in and out. In fact, with the help of this valve, it is possible to control the flow of incoming and outgoing water and change its amount. The 6-way valve can be considered the most equipped type of these valves, with the help of which you can have more control over the performance of the sand filter. It is also easy to backwash the sand filter through it.

Pipes

Water transfer is the responsibility of the pipes used on the filter body. In such a way the water enters the filter from one side after entering the tank and then leaves the filter after completing the physical water filtration process.

Silica

Silica is one of the important components of sand filters. The silica used in the filter tank may be glass or sand. Of course, silica glass is more efficient and newer. As a biologically processed material, this product will provide better clarity and complete physical filtration of water.

Viewing window

In sand filters with a capacity of more than 2000 liters that are used in large swimming pool projects, it is necessary to design and install an inspection valve on the body of the sand filters to access the inside of the filter and check and inspect the condition of silicas and other internal components.

Pressure gauge

Usually, it is necessary to install a pressure gauge on the pool filter to control and check the water pressure inside the filter. Based on this, usually, all sand filters have a manometer (pressure gauge) with a working pressure of up to 6 bars.

How a pool sand filter works

The sand filter of the pool has an effective efficiency to create a clean water flow in the pool. Of course, keep in mind that the action of physical filtration of water is different from disinfection, and these two actions should not be considered the same. Sand filter needs silica for water purification. Silica can be considered the main ingredient for water purification.
The way the sand filter works is that first, the water enters the filter. Then, when the water flow passes through the coarse layer of sand, its large particles will be absorbed by silica. After that, water passes through another layer to separate minor pollutants left from the first layer. After this process, clear and transparent water is introduced into the piping system and then into the pool bowl or jacuzzi so that the people in the pool can use it. All these things are done in a short period.

What are the advantages of a pool sand filter?

The advantages of using a sand filter in the pool are:

• It is easier to maintain the sand filter compared to the diatomic and cartridge filters and it will be more affordable than them.
• The sand filter is easy to use.
• There is a possibility of an easy supply of all sand filter equipment and models in Iran.
• This filter will reduce water consumption in an up-to-date and modern filtration system.

Getting to know the uses of pool sand filter

These filters can physically purify river water and well water. Therefore, if well water is used for a swimming pool, a sand filter can be considered as a suitable option for its physical purification. These filters are also used in many fish breeding ponds. Because this filter can filter all harmful pollution for fish. Pool sand filter is also used in some industries. In addition, this type of filter is used in the complete purification of water in power plants and its re-entry into the industrial cycle. Other uses of pool sand filters include drinking water and cooling tower water purification.

Introduction of different types of pool sand filter

In general, the design and construction of the pool sand filter are done in different types according to the material of the body, the volume or capacity of the filter, as well as the amount of working pressure. All models of sand filters remove pollutants in water without changing the structure of water or adding any chemicals to it, which is considered an advantage. But the higher energy consumption of these filters compared to other filters can be considered as one of their disadvantages. In the following, we introduce the types of sand filters.

Quicksand filter

In this type of filter, the silica is inside a closed tank and the jacuzzi or pool water will pass over the silica bed under the pressure of the pump. 3-4 sizes of silica are used in this filter.

Slow sand filter

This type of sand filter can be considered one of the old examples. The silica used in this type of filter is in the vicinity of free air and water passes through it without pressure to the bottom and the outlet pipe of the filter.

Pressurized sand filter

This type of filter is the same as the sand filter of the steep pool, where the amount of water passing per square meter is calculated. In this filter model, the size of the silica grains is larger and as a result, it will allow water to pass with less pressure drop and faster speed. The pressurized sand filter can be used in pools with a small number of swimmers. Small occupied space, low price, and small volume of passing water are among the advantages of this type of filter.

You can also read the article COMPARISON OF SAND FILTER AND CARTRIDGE FILTER AND DIATOMACEOUS FILTER for more information.

Conclusion

A sand filter is one of the required pieces of equipment in any swimming pool. These filters are used to purify the water in the pool and this pool equipment purifies the water from physical pollution. These filters have many features and have different types in terms of body type, volume or capacity, working pressure, brand, and type of silica granulation, each of which has specific uses.

final word

On the site of Damatajhiz's specialized collection, technical information of dozens of models of sand filters for pool purification, from reputable brands with original warranties, has been presented for you to enjoy the good feeling of optimal and smart shopping.

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