Pleated Depth Filters

When the range of particulate contamination is better understood and narrower in range then pleated depth filters are used because of their pleated filter media. This offers far better flow characteristics than similar sized depth cartridge filters, reducing initial capital cost or reducing running costs by signficantly extending the cartridge service life.

Acting as a prefilter, pleated depth cartridge filters perform an important role by protecting follow-on membrane technologies - microfiltration, ultrafiltration, nanofiltration, and reverse osmosis - so their efficacy and service life can be maximised.

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What are pleated depth cartridge filters?

A pleated depth filter is a hybrid filtration technology that combines the benefits of pleated filters and depth filters to provide high dirt-holding capacity, efficient contaminant removal, and extended service life. The pleated design maximizes surface area, allowing for higher flow rates and extended service life, while the depth filtration media captures contaminants throughout the entire thickness of the depth media for long service life.

How do pleated depth filters differ from standard depth filters?

Standard depth filters capture particles throughout the filter media but may have limited surface area, leading to shorter service life. Pleated depth filters, however, have a pleated structure that increases the surface area, providing higher dirt-holding capacity and longer operational life.

What materials are used in pleated depth cartridge filters?

These filters are commonly made from materials such as polypropylene, glass fibre, or polyester. The choice of material depends on the specific application and the chemical compatibility required.

What micron ratings are available for pleated depth filters?

Pleated depth filters are available in various micron ratings, typically ranging from 1 to 100 microns, allowing for precise filtration based on the application's requirements. Pleated depth filters can be supplied in either absolute (Beta 5000) or nominal ratings.

Read more on Absolute & Nominal Cartridge Ratings HERE.

In which industries are pleated depth filters commonly used?

These filters are widely used in industries such as pharmaceuticals, food and beverage, electronics, and water treatment, where precision filtration is essential to remove fine particles and ensure product quality.

How often should pleated depth filters be replaced?

The replacement frequency depends on factors like the level of contaminants, flow rates, and specific application requirements. Regular monitoring of pressure drop across the filter can help determine the optimal replacement schedule. The industry standard is that filters are changed at a pressure drop of 2.5 bar (37 psi).

Can pleated depth filters be cleaned and reused?

Most pleated depth filters cannot be cleaned or reused. However some manufacturers claim that backwashing does regenerate the filter extending the service life, depending on the filter material and the nature of the contaminants. However, it's essential to follow the manufacturer's guidelines on this procedure and ensure only minimal back pressure is applied to the cartridge in reverse flow.

What are the advantages of using pleated depth filters over other filter types?

Pleated depth filters offer a higher dirt-holding capacity, longer service life, and the ability to handle higher flow rates compared to some other filter types, making them cost-effective and efficient for various applications.

How do I select the appropriate pleated depth filter for my application?

Consider factors such as the type and size of particles to be removed, chemical compatibility, required flow rates, and the operating environment. Consulting with a filtration specialist can help in selecting the most suitable filter.

Are pleated depth filters compatible with high-temperature or high-pressure applications?

Certain pleated depth filters are designed to withstand higher temperatures and pressures due to the addition of a st.st inner core. However the continuous maximum operating temperature is only 100^oC. It's crucial to verify the filter's specifications to ensure compatibility with your specific application conditions. For most continuous applications above 100^oC then st.st cartridges become the product of choice.