Complete replacement filter set only for APEC ROES-UV75-SS with serial number AZ-UVSS-2500 and above Made with high quality filtration components to all contaminants including arsenic, bac., chlorine, lead, fluoride, chromium, radium and more Includes 1 sediment, 2 carbon block filters, 1 high rejection TFC membrane, 1 UV light bulb and 1 inline carbon filter for complete reverse osmosis filtration Pre-filter set lasts over 6 months for high performance contaminant removal; the TFC membrane and post carbon filter last 2-4 years The 5th stage continuous UV sanitization destroys up to 99. 99% of bac., vir. and cysts for chemical-free purified drinking water