Purtrex PX30-9-7/8 Water Filters (1 Case/40 Filters) 100&#37; pure polypropylene depth filter provides outstanding dirt-holding capacity True-graded density matrix utilizes the entire filter depth to increase cartridge life Thermally bonded microfibers capture particles that are 30 microns or larger in size Contains no wetting agents&#44; solvents&#44; antistatic agents or binders&#44; and meets FDA Title 21 1 Case - 40 Filters