The Micron filter of 1.0, 0.45, & 0.2 are housed in a specially manufactured SS 316 housing. The code of the cartrid ges used is code 4-PP, PVDF, Pleated, Membrane cartridge. Specially Electro polished SS 316 housing with Derry Bends and SMS easily unlock fitting are used.The micron cartridge used are PP, PVDF, Pleated Membrane, cartridges.   Details : They are far superior to any pleated, PP, cartridges.The rating of the cartridges are absolute and guarantee to give the rating of filter prescribed