The Culligan H53 filter set replacements. You should change your RO water filters every 12 months to enable your system to produce the highest quality of water. Culligan Reverse Osmosis Membranes are available as well.
(1) 5 Micron Sediment
(1) Carbon Block filter
(1) Inline GAC cartridge 6" (1/4" Female with 2-3/8" fittings and 2-1/4" Fittings)
All three should be replaced once a year.
Membrane is not included in this set, you change membrane every 3 years