Flowmatic MAXVOC-975RV Flow-Pur Tear Drop Number 6 Water Filter is a solid block activated carbon replacement cartridge. It filters 0.5 micron nominal for lead, VOCs, giardia eatamoeba, toxoplasma and cyproidium cysts, chlorine, foul taste or odor, fine sediment and rust particles. The #6 filter cartridge fits most standard 10" filter housing canisters. Works at pressures from 20 to 125 psi with 1 gallon per minute flow rate. It is recommended to replace every 6 months.