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String Wound vs. Melt Blown Filter Cartridges: Key Differences for Water Filtration

Jan 31 2025

string wound vs melt blown filter cartridge

Have you come across a question on ‘What is Melt Blown Filter Cartridge’ and ‘What is String Wound Filter Cartridge’ and their application in filtration industry?

There is a lot of confusion in selection for String Wound Filters and Melt Blown Filters. Both are designed in a unique way so that both have their own distinct benefits. In this blog we will show a detailed comparison of both kind of filters.

What is a String Wound Filter Cartridge?

String Wound Filter Cartridge or wound filter cartridges are a cylindrical shape filtration solution formed by winding PP yarn firmly on/ a core. Wound filter cartridges help in reducing sediment, dirt, sand, and other particles from water. Wound filter cartridges are also known as wire wound filters and rope wound filters.

Features:

Smart Layered Design: The filter’s unique layered structure, where string/yarn layers vary in diameter, creates a gradient that efficiently traps particles of different sizes.

Handles More Dirt: Thanks to its large void spaces, this filter can hold a significant amount of debris before it needs to be replaced, making it reliable for heavy-duty filtration needs.

Made for Versatility: These filters are available in various materials like polypropylene, cotton, or polyester, giving you options based on your specific application.

Budget-Friendly Choice: With its straightforward production process, the string wound filter is one of the most affordable filtration solutions on the market.

Where It Works Best

String wound filters shine in applications like:

  • Water Filtration
  • Industrial Fluid Processing
  • Municipal Water Treatment

They’re perfect for tackling large particles and areas with high sediment levels, ensuring cleaner, more efficient water systems.

See Also: String Wound Cartridge Filters: The Perfect Filtration Solution

What is a Melt Blown Filter Cartridge?

A melt blown filter cartridge is made by melting thermoplastic granules like polypropylene and carefully layering them onto a central core. This process creates a dense, tightly packed matrix that’s incredibly effective at capturing even the finest particles. It’s a smart solution for achieving cleaner and more refined filtration results. Melt blown filter cartridges are also known as depth filters or spun filters.

Features:

High filtration efficiency: The fine fiber matrix captures contaminants as small as 0.3 microns, making it ideal for removing sediment, fine debris, and even certain chemicals.

Uniform structure: The fixed fiber placement ensures consistent performance and uniform dirt distribution.

Chemical compatibility: Melt blown cartridges are suitable for use with a wide range of chemicals, making them ideal for reverse osmosis (RO) pre-filtration and chemical processing.

Ease of use: Lightweight and simple to install, these filters are popular in domestic and industrial water filtration applications.

Read more: Melt-Blown Filter Cartridge: What Is It? How Does It Work?

Key Differences Between String Wound and Melt Blown Filters

Filter Media and Construction

  • String wound filters are created by wrapping yarn around a core, which produces a structured but less dense filter matrix.
  • Melt blown filters are created by extruding thermoplastic resin into fine fibers, which produces a denser filtration matrix with greater surface area.

Filtration Efficiency

  • String Wound Filters hold more debris due to their larger void spaces, making them suitable for high-sediment applications.
  • Melt Blown Filters distribute dirt more uniformly, extending their life and efficiency in environments with finer particulates.

Cost Considerations

  • String Wound Filters are typically more affordable, but Melt Blown Filters offer better performance for capturing smaller contaminants. The choice depends on the budget and the specific filtration needs.

Applications

Melt Blown and String Wound Filters serve distinct purposes in water filtration, each excelling in specific scenarios.

Melt Blown Filters

Designed for high-efficiency filtration, Melt Blown Filters are ideal for applications like reverse osmosis (RO) pre-filtration and chemical processing. Made from polypropylene, they are highly compatible with various chemical fluids and excel at capturing fine particles, delivering cleaner and more precise results.

String Wound Filters

When it comes to handling higher sediment levels, String Wound Filters are the go-to solution. With their high dirt-holding capacity, they are perfect for industrial, agricultural, and municipal applications. They effectively remove larger particles and sediment, making them an excellent choice for well water filtration, irrigation systems, and industrial fluid processing.

string wound vs melt blown filter cartridge cta

Optimize Your Filtration System with mmp

At mmp® Filtration, we offer NSF certified Oceanic® and Lagoon® Melt Blown Filter Cartridges and Hydro® Wound String Wound Filter cartridges in wide range and sizes in order to meet the demands as per needs.

With more than 2 decades of experience in the filtration industry and in house manufacturing of all products we ensure you get the best filters for your filtration needs/requirement.

Choosing the right filters not only will improve the durability of the system but also will be effective in providing clean and pure water.

Contact us today for expert guidance and support!

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