The Q-Series filter, manufactured by Omnipure, is an easy-to-install replacement cartridge that twists right into a permanent head.
The Q5605 sediment filter reduces sediment particles, including dirt and sand, up to 5 microns.  
The Q5640 carbon block filter reduce chlorine, taste and odor making it ideal for pre- or post RO filtration.
Filters may need to be replaced more often than indicated depending on incoming water contaminant levels and volume of water being treated.