Fil-Fresh 6-Pack Water Filter Replacement for PUR, PUR PLUS Faucet Water Filtration System, NSF Certified, Replace Mineral Core Faucet Mount Water FilterPerfect Fit: Compatible with all PUR, PUR PLUS faucet water filter systems (classic, advanced, vertical & horizontal), including FM3700, PFM400H, PFM350V, PFM100B, FM4000B, PFM450S and more. All manufacturers' names and part numbers are used for compatibility information only Save Your Bills: 6 Packs work as well as the original filters, but at a lower cost. Filter up to 100 gallons of water or replace it every 3 months Powerful Filtration: NSF