Geotextile composite configured to filter liquids The geotextile composites include a pre-filter layer, a post-filter layer and at least two intermediate filter layers disposed between the pre-filter layer and the post-filter layer. An apparatus for manufacturing a cutting insert green body having undercuts includes top and bottom dies which abut each other and top and bottom punches which slide in their respective dies. Sample is introduced into the ionization chamber from an electrospray assembly at approximately ground potential. The frequency of the driving voltage coupled to the piezo-electric actuator is varied and the velocity of the object is recorded as a function of the frequency. Introducing Cl into the stacked pattern may at least partially cure defects that are caused therein during fabrication of the structure. One method embodiment, among others, comprises a client sending an end of transmission request to an access point, and responsive to the EOT request, the AP responding with an EOT frame.