4 Stage Water Filter

 

4-stage water filter refers to a water purification system with four filter cartridges. People choose four different filter cartridges according to the different water quality they are dealing with and combine them into a 4-stage water filter system.

In areas with normal water quality, the four-stage filter element is generally configured as follows:

 

Primary filtration

Primary filtration Water purifiers on the market now generally use 5μm PP cotton as the filter material, which is used to remove large particles of impurities such as rust, sand, suspended matter, and coarse filtration. It is usually replaced every 3-6 months.

 

Secondary filtration

 

The granular activated carbon filter (UDF) integrates adsorption, filtration interception and catalysis, and can effectively remove pesticides, pesticide residues, organic solvents and other chemical pollution caused by industries. It can also effectively remove organic matter, residual chlorine and other radioactive substances in water, and has the effect of decolorization and deodorization. The general service life is 3-6 months.

 

Three-stage filtration

 

The third-stage filter element is generally used as the main filter element. The main filter element has a variety of filter elements of different materials to choose from, which can be selected according to the water quality requirements.
1. Ultrafiltration membrane filter element: filtration accuracy is 2-100 nanometers, it is recommended to replace it every 2 to 3 years.
2. Nanofiltration membrane filter element: filtration accuracy is 0.5-5 nanometers, it is recommended to replace it every 2 years.
3. RO reverse osmosis membrane filter element: filtration accuracy 0.1-1 nanometers, it is recommended to replace it every 2 years.

Four-stage filtration

 

As the last step of the water purifier, the post-activated carbon filter (CTO) can further absorb the foreign colour and odour in the water, increase the oxygen content of the purified water, and mainly improve the taste of the water. Especially for water purifiers using pressure water storage tanks, it is recommended to use silver-loaded activated carbon filter material for the post-activated carbon, which can effectively absorb the odour generated by the water storage tank and sterilize and inhibit bacteria to ensure the safety of drinking water. The recommended service life is 12 months.

 

 

If one of the following situations occurs, you have to replace the water purifier filter.

 

1. The water flow rate becomes very small (indicating that the filter is clogged and the filter should be cleaned to restore normal flow), and the flow rate is still very small after cleaning and cannot meet the needs;

 

2. The taste of the water is reduced and the taste is close to tap water, that is, the chlorine taste of tap water cannot be removed, indicating that the activated carbon filter has been saturated with adsorption and the activated carbon has failed;

 

4. The filter has been used for more than the specified time.

 

If the above situations occur, it means that the filter needs to be replaced. Please replace the filter in time to ensure the health of your family's drinking water.

 

 

 

In general water purifiers, PP cotton is the first-level filter element, and both ultrafiltration machines and pure water machines are equipped with it. This is mainly because it has the advantages of high filtration efficiency, small pressure loss, stable filtration efficiency, long service life, low filtration cost, good safety, and strong adaptability. Please see the following introduction to the structure of PP cotton filter element:

 

PP cotton filter element is made of ultrafine polypropylene fiber hot-melt entanglement. Ultrafine fibers rely on their own bonding and entanglement to randomly form a three-dimensional microporous structure in space. The connection between fibers does not require any adhesive. In particular, it has the characteristics of radial fiber gradient change. It is a combination of porous and fabric filter media. The filter element can form deep filtration on the one hand and surface filtration on the other hand. It is a composite filter material that integrates pre-filtration, fine filtration and gravity sedimentation. It has been widely used in the purification of drinking water, filtration of industrial pure water and filtration of other fluids.

The new melt-blown filter element is different from the traditional fabric filter material. The wire diameter of this material is very fine, often less than 5~25 microns, and the fiber presents an irregular porous mesh structure, with an average diameter of less than 40 microns and an average porosity of more than 75%. Such a structure is very reliable for controlling the filtration accuracy.

 

The fine fiber layer inside the PP cotton filter element and the coarse and loose fiber layer outside form a double-layer fiber structure, which effectively reduces the pressure loss and maintains a stable filtration efficiency. The micropore diameter of the PP filter element is distributed in a gradient along the diameter direction. During filtration, the large pore size part can accommodate larger particle impurities, ensuring that the filter element will not be blocked quickly, while providing good shape rigidity. The small pore size part can block fine particles, ensuring the filtration accuracy, thereby avoiding the drawbacks of high-precision filter elements that are blocked quickly and have a short life, and also reduces the filtration resistance, reduces the energy consumption of the equipment, and extends the service life of the filter element.

 

The materials used to prepare PP cotton filter elements are all non-toxic and odorless PP materials. The raw material source is reliable and safe. No other chemical substances are generated during the production process. It can be directly used for drinking water and beverage products. Because there is no adhesive medium, no soluble materials appear during application.

 

PP cotton function: mainly filter out large particles in the water, such as mud, rust, colloids, etc., and can also protect subsequent filter elements. Its working principle is filtration. When water flows through the PP cotton filter element, the irregular pore size will intercept substances larger than these pore sizes. Because it is the first-level filter element, it is easy to be blocked by dirt and needs to be replaced about every three months. However, PP cotton has low cost and will not bring burden to consumers.

 

 

 

The activated carbon filter element is made of high-quality fruit shell charcoal and coal-based activated carbon as raw materials, supplemented with food-grade adhesives, and processed by high-tech technology and special processes. It integrates adsorption, filtration, interception, and catalysis. It can effectively remove organic matter, residual chlorine and other radioactive substances in water, and has the effect of decolorization and removal of odor. It is a relatively ideal new generation product in the liquid and air purification industry. Types: white-head sintered activated carbon filter element, black-head sintered activated carbon filter element with skeleton, granular activated carbon filter element.

Activated carbon filter elements are divided into compressed activated carbon and granular activated carbon:

 

1. Compressed activated carbon filter elements use coal-based activated carbon and coconut shell activated carbon with high adsorption value as filter materials, and are sintered and compressed with food-grade adhesives. The inside and outside of the compressed activated carbon filter element are wrapped with a layer of non-woven fabric with filtering function to ensure that the carbon core itself will not drop carbon powder. Soft nitrile rubber sealing pads are installed at both ends of the carbon core, so that the carbon core has good sealing when installed in the filter cartridge.

 

2. Bulk activated carbon filter element: Put the required activated carbon particles into a special plastic shell, weld the end caps to the two end faces of the shell with welding equipment, and put non-woven filter discs for filtering at both ends of the shell to ensure that the carbon core will not drop carbon powder and black water when in use. According to customer needs, the shell end caps can be made into different types of connectors. The interface modes are: flat press type and pipeline type.

 

The role of activated carbon: Activated carbon integrates adsorption, filtration interception, and catalysis, which can effectively remove pesticides, pesticide residues, organic solvents and other chemical pollution caused by industry. It can also effectively remove organic matter, residual chlorine and other radioactive substances in water, and has the effect of decolorization and deodorization. The general service life is 3-6 months.

 

 

RO is the abbreviation of Reverse Osmosis. Generally, water flows from low concentration to high concentration. Once water is pressurized, it will flow from high concentration to low concentration, which is the so-called reverse osmosis principle: Since the pore size of the RO membrane is one-millionth of a hair (0.0001 microns), it is generally invisible to the naked eye, and bacteria and viruses are 5000 times larger than it. Therefore, only water molecules and some mineral ions can pass through (the ions passing through have no loss orientation), and other impurities and heavy metals are discharged from the wastewater pipe. All seawater desalination processes and astronaut wastewater recycling and treatment use this method, so the RO membrane is also called the high-tech "artificial kidney" in vitro. At present, at home and abroad, the medical military and civilian fields all use top-level RO membranes for polymer filtration.

 

Reverse osmosis is a new membrane separation technology developed in the 1960s. It is a process that relies on reverse osmosis membranes to separate solvents and solutes in a solution under pressure.

 

Reverse osmosis usually uses asymmetric membranes and composite membranes, and the equipment used is mainly hollow fiber or roll membrane separation equipment. Reverse osmosis membrane can intercept various inorganic ions, colloidal substances and macromolecular solutes in water, so as to obtain purified water. It can also be used for pre-concentration of macromolecular organic solutions. Due to the simple process of reverse osmosis and low energy consumption, it has developed rapidly in the past 20 years. It has been widely used in desalination of seawater and brackish water, softening of boiler water and wastewater treatment, and combined with ion exchange to produce high-purity water. At present, its application range is expanding, and it has begun to be used for the concentration of dairy products and fruit juices, as well as the separation and concentration of biochemical and biological agents.

 

RO membrane filtration principle

 

RO membrane function: It can effectively remove calcium, magnesium, bacteria, organic matter, inorganic matter, metal ions and radioactive substances in water. The crystal clear, sweet and mellow water purified by the device is suitable for drinking water purification in households, hotels, hospitals and other enterprises and institutions. Because the RO membrane will be washed with water during use to keep the surface of the membrane clean, the service life is relatively long, and the general replacement time is two to three years.

 

 

Nanofiltration membrane refers to a membrane whose permeate size is 1-10nm. The separation layer on the membrane surface may have a nanoscale (below 10nm) pore structure, so it is customarily called "nanofiltration membrane", also known as "nanomembrane" or "nanotube".

 

Working principle of nanofiltration membrane
Nanofiltration is a liquid-liquid separation method in which salts and small molecules pass through the nanofiltration membrane under the driving force of pressure difference, while large molecules are retained. It is also called low-pressure reverse osmosis. The molecular weight cutoff range of the nanofiltration membrane is 200-1000MWCO, which is between ultrafiltration and reverse osmosis. It is mainly used for the concentration and purification of large molecules in solution.

 

 

Ultrafiltration membrane is a microporous filtration membrane with a pore size range of 5nm~50nm. The membrane filtration method using pressure difference as the driving force is called ultrafiltration membrane filtration.

 

Ultrafiltration is the most widely used and mature one. When a membrane is used to separate particles with a diameter of less than 50nm from other low molecular weight components or solvents, this membrane separation process is called ultrafiltration. It is a kind of membrane technology that uses the pressure difference on both sides of the membrane as the driving force. The membrane pore size range of the membrane is generally 5-50 nm, the static pressure difference used is generally 100-500kPa, and the osmotic pressure of the feed liquid is generally very small and negligible. Ultrafiltration is an ultra-precision filtration. Its core is an ultrafiltration membrane made by a special process. The thickness of the ultrafiltration membrane is about 0.1 mm and can be roughly divided into three layers. The surface layer thickness accounts for about 1% of the total thickness, with small pores of about 10nm. Under the surface layer is the support layer, the pore size is much larger, and the bottom layer is composed of a mountain sponge structure and large pores above 1um. In an ultrafiltration membrane, only the thin surface layer can play a separation role, and the other parts only serve to increase the strength. Due to its special structure, the ultrafiltration membrane has extremely high separation accuracy, less filtration resistance, and is not easy to clog.

 

 

 

Q: What is your MOQ?

A: Our MOQ is 50PCS per order. For first trial orders or some regular products, the quantity can be 30 pieces. Meanwhile, we stock some products in the USA and Germany, and you can also directly buy from us in small quantities if we have overseas stock.

 

Q: How do I get a sample?
A: Sample order is acceptable. Pls contact us and make sure what sample you need.

 

Q. Can you produce products with my logo?

A: Yes, we can laser your logo on the product and design the packaging with your logo. We accept customization of appearance, function, program, packaging, etc.

 

Q: Can you help us arrange the shipment?

A: Yes, professional forwarders have cooperated with us for many years to arrange shipment.

 

We're professional 4 stage water filter manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to buy high-grade 4 stage water filter at competitive price from our factory.

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