This is the reverse osmosis replacement filter set for the TGI WIN-445 drinking water system. Included in the set is the 5 Micron Sediment, a 10 micron carbon block, and the 10" inline GAC cartridge.
When to change your RO filters: 1 time every 12 months
When to change the membrane in your system: Every 4 years.
If you need the membrane, look for the TW30-1812-50 membrane by Filmtec in our store, it is the recommended choice.