Similarities and differences between Hytrex, Purtrex and Ro.Save.Z GE Depth Cartridges: Similarities: 100% Polypropolene Nominally rated micron Depth Cartridges Graded Density;┬áThe media catches larger particales from the outside and smaller particles as it reaches the core No lubricants or anti-static agents Front Facial Velocity;┬áThe speed that liquid enters the filter and goes to the core. […]

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