Felt filter bags
Felt filter bags are selected for depth filtration where higher dirt holding capacity and stable performance are required. They retain contaminants throughout the felt structure and are commonly used in process filtration and water treatment.
Selection is typically based on media material (polypropylene, polyester, Nomex or PTFE), required micron rating, chemical compatibility and operating temperature, as well as bag size and sealing configuration.
Felt bags are a broad, general-duty solution when longer service life is required under variable or elevated solids loading. If you share your fluid and target rating, we can advise a technically grounded option.
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Monofilament filter bags
Monofilament filter bags are selected for surface filtration where a defined mesh opening and predictable separation is required. Contaminants are retained primarily on the surface, supporting easy inspection and, in many applications, cleaning and reuse under controlled procedures.
Selection is based on mesh opening, media material (nylon, polyester or metallic mesh), chemical compatibility and operating temperature, as well as bag size and sealing configuration to minimise bypass.
Monofilament bags are commonly used as pre-filtration to remove larger particles and protect downstream filtration stages. If you share your process fluid and target separation, we can advise a technically grounded option.
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Extended life filter bags
Extended life filter bags are designed to increase dirt holding capacity and extend service intervals compared to standard single-layer felt bags. Double layer and multilayer constructions support more even loading of the media and longer run times.
These bags are typically selected when reducing change-out frequency and downtime is a priority. Selection is based on media material (polypropylene or polyester), required micron rating, fluid compatibility and operating conditions, as well as bag size and sealing configuration.
Extended life designs are commonly applied in process filtration and water-related duties with higher or variable solids loading. If you share your process details and target rating, we can advise a technically grounded option.
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Absolute rated filter bags
Absolute rated filter bags are selected for critical filtration steps where defined retention and consistent filtration efficiency are required. They are typically applied when predictable separation is essential to protect product quality or downstream filtration stages.
This category also includes advanced constructions such as the BOS Filter bag (BOS MAX), which uses a layered, graded pore structure with a semi-rigid internal support to increase depth filtration, dirt holding capacity and service life. Its seamless construction and Polyloc® top help minimise bypass and support quick installation and removal.
Correct selection depends on the required retention definition, process fluid compatibility, operating conditions and housing configuration. Proper bag fit and sealing are essential to minimise bypass and maintain filtration performance.
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Speciality filter bags
Speciality filter bags are selected for specific filtration challenges where standard felt or monofilament bags are not sufficient. These bags use specialised media or constructions to address defined contaminants or process requirements.
Selection is typically application-driven and based on fluid composition, contaminant type and the required functional behaviour rather than micron rating alone.
This category includes highly specialised solutions such as oil absorption bags and MAXPONG filter bags, which are selected for advanced contaminant reduction beyond conventional particulate filtration.
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