Coiled filter strip with upstream and downstream butt ends

A filter element comprising:

• at least one rolled strip having a raised line portion on at least a first surface thereof, the raised line portion having a generally zig-zag configuration, wherein the second surface of at least one rolled strip and the raised line portion of the first surface of at least one rolled strip from a serrated filtration pathway, the serrated filtration pathway defining a plurality of upstream chambers associated with a fluid inlet and a plurality of downstream chambers associated with a fluid outlet.

A filter element comprising a plurality of rolled strips defining upstream and downstream butt ends, the plurality of rolled strips comprising a porous strip and a spacer strip, wherein a surface of the porous strip is operatively associated with a surface of the spacer strip such that a plurality of filtering chambers are defined, the filtering chambers being open to only one butt end of the plurality of rolled strips,

• characterized in that each filtering chamber open to only the upstream butt and is disposed generally opposite a corresponding filtering chamber open to only the downstream butt end, the corresponding filtering chambers being separated by the porous strip.