Ardent FX Scent Shield Carbon ReplacementStock up on the Ardent FX Scent Shield Carbon Replacement Filters! The new Ardent FX Scent Shield provides an extra layer of security for your discretion and a solution for sensitive noses. The pancake mesh filters nestle inside the odor trapping lid, which can be disposed of and replaced. Each filter uses activated carbon as a smell neutralizer and deodorizer, binding the odor molecules and attaching them to the surface.