Double Open End (DOE) cartridges are ideal for non-critical, general purpose filtration and pre-filtration applications, where operating economies are of prime importance. Most commonly seen on SupaGard style cartridges.
As above but seen on cartridges that have solid moulded end caps. Robust fixed length elements with little compression, again not associated with fine levels of filtration. The seal is made by the knife edges into the gaskets of the cartridge.
Amazon Codes 3 and 8 utilises 2 x 222 ‘O’ rings at the open end.
Amazon Code 3 utilises a flat blanking cap at the closed end. This is one of the most common styles used in industrial and pure water applications around the world.
Amazon Code 8 utilises the same ‘O’ rings on the Code 3 configuration, but with a spear (or bomb-fin) at the closed end. The function of the spear is to help centralise the cartridge on installation of longer cartridge lengths.
Codes 7 and 2 configurations uses 2 x 226 ‘O’ rings combined with a double bayonet at the open end. The function of the bayonet is to be located under a corresponding component in the housing design, which allows the operator to confirm successful installation, prevents the cartridge being dislodged during sterile filtration, guards against the possibility of seal failure due to reverse flow and prevents the cartridge lifting out on backflushing. This is the standard configuration cartridge for many critical processes within the pharmaceutical and beverage industries.
The Code 7 uses a spear (or bomb-fin) on the closed end.
The Code 2 uses the flat blanking cap at the closed end of the cartridge.
The Code S cartridge uses 2 x 222 ‘O’ rings combined with a 3 lug bayonet design, achieving the same advantages as Codes 7 and 2.
This is combined with a spear (or bomb-fin) at the closed end.
Amazon Codes A and B use a double ‘O’ ring at the open end
Code A uses a spear at the closed end (for cartridge centralisation when using longer lengths) and is an excellent general purpose design for critical applications.
Code B uses a flat blanking cap at the closed end (generally recommended for single cartridge housings) and is an excellent general purpose design for industrial applications.
The Code 6 configuration uses 2 x 020 ‘O’ rings located on a spigot in the housing, which fits to a precision sized bore in the cartridge itself. This style is often found within single cartridge plastic filter housings.
this is combined with a recessed closed cap to allow centralisation of the cartridge via a spigot in the bottom of the housing.
The Code 9 style uses a single 213 internal ‘O’ ring, which seals onto a spigot within some styles of plastic housing.
this is combined with a recessed closed cap to allow centralisation of the cartridge via a spigot in the bottom of the housing.
Double Open End (DOE)
Double Open End (DOE) cartridges are open at both ends and sealed by a knife edge mechanism. They can be stacked for longer lengths, but full-length versions are preferred. The DOE system is prone to damage and installation errors, reducing filter efficiency, and is not recommended for filtration below 5 µm, high temperatures, or sanitization.
Single Open End (SOE)
Single Open End (SOE) cartridges have one end blocked and the other end open with an end cap and built-in ‘O’ rings for a reliable seal. They are easier to install and maintain, with fewer internal components. Various designs are available for specific applications, and certain codes (2, 3, 7, 8, A and B) are available in Reinforced Glass Filled Polypropylene, making them suitable for high-temperature uses and steam sterilization.
Double Open End (DOE) cartridges are ideal for non-critical, general purpose filtration and pre-filtration applications, where operating economies are of prime importance. Most commonly seen on SupaGard style cartridges.
As above but seen on cartridges that have solid moulded end caps. Robust fixed length elements with little compression, again not associated with fine levels of filtration. The seal is made by the knife edges into the gaskets of the cartridge.
Amazon Codes 3 and 8 utilises 2 x 222 ‘O’ rings at the open end.
Amazon Code 3 utilises a flat blanking cap at the closed end. This is one of the most common styles used in industrial and pure water applications around the world.
Amazon Code 8 utilises the same ‘O’ rings on the Code 3 configuration, but with a spear (or bomb-fin) at the closed end. The function of the spear is to help centralise the cartridge on installation of longer cartridge lengths.
Codes 7 and 2 configurations uses 2 x 226 ‘O’ rings combined with a double bayonet at the open end. The function of the bayonet is to be located under a corresponding component in the housing design, which allows the operator to confirm successful installation, prevents the cartridge being dislodged during sterile filtration, guards against the possibility of seal failure due to reverse flow and prevents the cartridge lifting out on backflushing. This is the standard configuration cartridge for many critical processes within the pharmaceutical and beverage industries.
The Code 7 uses a spear (or bomb-fin) on the closed end.
The Code 2 uses the flat blanking cap at the closed end of the cartridge.
The Code S cartridge uses 2 x 222 ‘O’ rings combined with a 3 lug bayonet design, achieving the same advantages as Codes 7 and 2.
This is combined with a spear (or bomb-fin) at the closed end.
Amazon Codes A and B use a double ‘O’ ring at the open end
Code A uses a spear at the closed end (for cartridge centralisation when using longer lengths) and is an excellent general purpose design for critical applications.
Code B uses a flat blanking cap at the closed end (generally recommended for single cartridge housings) and is an excellent general purpose design for industrial applications.
The Code 6 configuration uses 2 x 020 ‘O’ rings located on a spigot in the housing, which fits to a precision sized bore in the cartridge itself. This style is often found within single cartridge plastic filter housings.
this is combined with a recessed closed cap to allow centralisation of the cartridge via a spigot in the bottom of the housing.
The Code 9 style uses a single 213 internal ‘O’ ring, which seals onto a spigot within some styles of plastic housing.
this is combined with a recessed closed cap to allow centralisation of the cartridge via a spigot in the bottom of the housing.
Cartridge and endcap blanks give you more control over your system. Use them to pressure test housings for leaks and rule out mechanical issues during integrity testing. Blank off unused cartridge locations when flowrates drop so you can run fewer filters without changing the housing. And when you upgrade to higher‑performance cartridges, blanks let you safely reduce the number of elements while keeping the same validated housing in place.
With our years of experience, Amazon Filters has a proven dedication to enhancing filtration systems and continuously innovating our processes to give you the best possible solutions.
We understand that with filtration there is no one solution to suit all customers' needs, which is why Amazon Filters looks to audit your filtration system and find a solution that is bespoke to your needs.
Amazon Filters has provided filtration solutions to multiple large, global-scale companies in a variety of industries, including Municipal Water, Energy, Chemicals, Food & Beverage, Pharma, and Healthcare.
