The Water General RO-545 and RO-535 5-stage reverse osmosis water filter set includes:

(1) 5 Micron Sediment Cartridge Filter
(2) 10 Micron Carbon Block Cartridge Filter
(1) 10" Inline GAC Cartridge Filter (1/4" Female with 2-3/8" fittings and 2-1/4" Fittings)

Set should be changed once per year.  Membrane is not included in this set, you change membrane every 3 years.