A cell-type filter cartridge is disclosed having netting thereon, as well as a method for producing same. Briefly stated, the surface area of filter material exposed to unfiltered fluid has disposed thereon a netting thereby preventing flaking, cracking and the like of filter media during backflow or...http://www.google.ca/patents/US5055192?utm_source=gb-gplus-sharePatent US5055192 - Cell-type filter cartridge retaining ring
