Mastering Industrial Water Filtration: An Ultimate Guide to Selecting the Right Filter Bags

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Filter bags are not just ordinary containers made of fabric or mesh that merely separate contaminants from liquids. They are advanced tools developed for precise and efficient industrial water filtration.

These bags are available in various materials, such as Polypropylene, Polyester, Nylon, and others, each with unique benefits. The selection of material and design directly affects the filtration process and result.

Today, we are going to guide you in understanding the filter bags from a comprehensive view and help you choose the right filter bags.

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What is the Filter Bag?

Filter bags are an essential component in industrial filtration applications. They are essentially porous bags specifically designed to remove contaminants and debris from liquids or gas. Unlike other filter technologies that collect solids on the outside, filter bags trap the dirt and impurities inside the bag, preventing them from dislodging during removal.

Types of Filter Bag Material & Its Application

There are many different kinds of filter bag materials in the market. However, we are discussing three of the most common ones used in the industrial water filtration system today.

1. PP (Polypropylene) Filter Bag

  • Chemical Resistance: Polypropylene is highly resistant to acids and alkaline, making it suitable for filtering chemical processes.
  • Temperature Tolerance: It can be used in processes where the temperature does not exceed 90-100°C.
  • Moisture Resistance: PP is hydrophobic, meaning it does not absorb water, which is beneficial in wet filtration applications.
  • Applications: Commonly used in food and beverage processing, pharmaceuticals, chemical processing, and any application where high chemical resistance is required.

2. Polyester Filter Bag

  • High Strength: Polyester is known for its high strength and durability.
  • Chemical Resistance: It has moderate resistance to acids and good resistance to most alkalis.
  • Temperature Tolerance: Suitable for medium-temperature applications.
  • Moisture Resistance: Polyester is more hydrophilic than polypropylene, which can be advantageous in certain applications.
  • Applications: Widely used in dust collection systems (like in cement, mineral, and wood industries) and also in liquid filtration where medium to high-temperature conditions are present. Suitable for applications where abrasion resistance is also needed.

3. Nylon Filter Bag

  • Durability: Nylon is known for its strength and durability.
  • Chemical Resistance: It has good resistance to alkalis but is not suitable for acids.
  • Temperature Tolerance: Nylon can operate at higher temperatures than polypropylene.
  • Applications: Often used in industries like paint, varnish, ink, and coatings due to its ability to withstand a variety of solvents and abrasive conditions. Also, it’s used in water filtration and in the filtration of solvents and oils.
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Advantages and Limitations of Different Materials

1. PP (Polypropylene) Filter Bag


  • Chemical Resistance: Excellent resistance to acids, alkalis, and organic solvents, making it versatile for various chemical environments.
  • Moisture Resistance: Hydrophobic nature repels water, preventing moisture absorption.
  • Non-Toxic: Generally considered safe and is often used in food and pharmaceutical applications.
  • Temperature Resistance: Can be used in environments with temperatures up to 90-100°C.
  • Cost-Effective: Usually more affordable compared to other synthetic materials.


  • Low Melting Point: Not suitable for high-temperature applications.
  • UV Sensitivity: Can degrade when exposed to UV light over long periods.
  • Limited Solvent Resistance: While it resists many chemicals, it may not be suitable for certain types of solvents.

2. Polyester Filter Bag


  • High Strength and Durability: Resistant to stretching and abrasion.
  • Good Temperature Resistance: Suitable for medium-temperature applications.
  • Chemical Resistance: Moderately resistant to acids and alkalis.
  • Moisture Absorption: Can handle moisture better than polypropylene, making it suitable for certain wet applications.


  • Limited Chemical Resistance: Not as chemically resistant as polypropylene, especially in extreme pH conditions.
  • Hydrophilic: Can absorb water, which may not be ideal for all types of filtration.
  • Temperature Limitation: Cannot be used in high-temperature applications as effectively as some other synthetic materials.
  • Cost: More expensive than polypropylene but typically less costly than nylon for filtration applications.

3. Nylon Filter Bag


  • Durability: Excellent abrasion resistance and tensile strength.
  • Flexibility: Can be easily molded into different shapes and sizes.
  • Higher Temperature Tolerance: Can withstand higher temperatures than polypropylene.
  • Good Alkali Resistance: Suitable for filtering solutions with high alkalinity.


  • Poor Acid Resistance: Not ideal for environments with acidic conditions.
  • Hygroscopic Nature: Tends to absorb water, which might affect filtration efficiency.
  • UV Degradation: Can degrade under prolonged exposure to UV light.
  • Cost: Generally more expensive than polypropylene.
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Key Factors in Selecting Filter Bags

1. Filtration Requirements

Consider the particle size and type of contaminants you need to remove. Different filter bag materials have varying filtration capabilities, so choose a material that can effectively capture the desired particles.

2. Compatibility

It is crucial to choose a filter bag material that is compatible with the fluid or gas being filtered, so you’d better take into account factors such as chemical and temperature resistance, as well as pH compatibility. This will prevent any damage to the filter bag or adverse reactions.

3. Efficiency and Performance

Evaluate the filtration efficiency and performance of the filter bag material before you choose it. Look for materials that offer high dirt-holding capacity, low-pressure drop, and consistent filtration performance over time.

4. Operating Conditions

Consider the operating conditions, including temperature, pressure, and flow rate. Choose a filter bag material that can withstand the specific conditions of your application without compromising its performance or integrity.

5. Budget

Consider the overall cost-effectiveness of the filter bag material by evaluating factors such as initial cost, maintenance requirements, and service life to determine its long-term value.

Advantages of Using Filter Bag

When we recommend the filter bags to our customers over other filtration products, we should highlight the of the advantages of filter bags, such as the following points:

1. Easy Installation and Maintenance

Filter bags can be easily replaced without specialized tools or training, minimizing downtime and operational difficulties.

2. Cost-effective

Filter bags are a cost-effective filtration method with a lower initial installation cost compared to other methods. They have a larger filtration capacity in a single bag which helps to reduce filtration costs. Moreover, filter bags have a longer service life, which results in cost savings over time.

3. High Filtration Capacity

Filter bags can handle a higher volume of contaminants, reducing the frequency of replacements and minimizing operational interruptions.

4. Wide Range of Applications

Filter bags are a versatile filtration solution that can be used in a wide range of industries and applications. They come in different sizes and materials, allowing for customization based on specific filtration needs. Filter bags are highly effective in removing contaminants and debris from liquids, making them ideal for use in industries such as food and beverage, chemical processing, and wastewater treatment.

5. Efficient Filtration Performance

Filter bags are highly effective in filtering liquids by removing contaminants and debris. They come with a specific micron rating that enables them to capture particles of various sizes. By keeping the clean side of the filter intact, filter bags prevent dislodging of solids during removal, ensuring efficient filtration performance.

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Suitable Housings for Filter Bag

The suitable housings for filter bags in industrial water treatment systems mainly include stainless steel and plastic.

1. Stainless Steel Bag Filter Housing

Stainless steel housings are made of 304L or 316L, suitable for high required operating conditions or strict sanitary requirements.

2. Plastic (UPVC & FRP)Bag Filter Housing

Plastic bag filter housings are an economical choice with a lower initial investment cost and are suitable for water treatment and compatibility with non-hazardous chemicals.


Choosing the right filter bags for industrial water filtration is crucial, which impacts the effectiveness of the filtration process and the associated costs, as well as compliance with environmental standards and the sustainability of the system.

If you need any information about filter bags, please feel free to contact us anytime. Our team of experienced water treatment experts will provide you with professional answers about any filtration product or solution.

We hope this article helps you make a more informed decision when selecting the most appropriate filter bag for your project in the future.

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