Filter replacement kit consisting of:
Vertex Model PT-4.0, PT-4.0/P,
1 sediment filter cartridge SF-4001
1 carbon block filter cartridge CF-4000
1 in-line carbon post filter unit IF-4002
1 filter wrench
2 “O” rings
We recommend changing the filters once every six months. The reverse osmosis membrane MF-4009 should be changed every year. FK-100 replaces part # FLT-100.