Complete 12-Month Filter Set: The F5DS-PF set lasts up to 12 months and includes 2×FPDS sediment filters, 1×FCPFDS SGS-tested carbon block filter, 1×FGKDS granular activated carbon & KDF composite filter, and 1×FTDS post-carbon filter, serving as a full replacement solution for iSpring DS4B-PF and DS4S-PF bottleless water dispensers SGS-Tested Superior PFAS Removal: The media of the FCPFDS carbon block filter is rigorously tested by SGS and proven to remove up to 99% of PFAS from your water, while also reducing chlorine, unpleasant odors, colloids, and particulates for clean, safe water Freshness Preserved in Every Filter: Each cartridge is individually sealed to maintain freshness until installation, and users should unwrap all cartridges before installation and flush the system for 3 to 5 minutes prior to drinking Hassle-Free, Tool-Free Installation: The F5DS-PF filters are designed for quick, easy replacement with iSpring DS4B-PF and DS4S-PF models, making routine maintenance simple and fast Not for TDS Reduction: This filter set does not reduce Total Dissolved Solids (TDS) like a reverse osmosis membrane, so customers seeking TDS removal should consider an iSpring Reverse Osmosis (RO) system