Under sink Aquasana reverse osmosis water systems include 3-4 filters and a membrane that must be replaced periodically. The different filters represent the different stages that the water goes through while being purified.Generally - Pre-Filters and Post-Filters in this RO systems can last aroumd 8 To 12 months between changes. With a high quality RO membrane can last as long as 5 years.
Aqua sana Set Of 5 Replacement Filters
Aqua SanaSet Of 5 Replacement Filters Cartridges Standard Size All 5 Stage Under Sink Reverse Osmosis Water Systems - Tankpro Pro 3.2 & 4.4 Reverse Osmosis Replacement Filters Cartridges - Aquasky Rot-4 Reverse Osmosis Replacement Filters Cartridges - PA-E Reverse Osmosis Replacement Filters Cartridges