1st stage: high capacity, 5 micron sediment filter, to remove sediment, rust, sand, (replace every 12 months)

2nd stage: high capacity carbon filter, coconut shell granular activated carbon removes chlorine, taste & odor (replace every 12 months)

3rd stage: high capacity carbon filter, coconut shell granular activated carbon further removing chlorine to ensure 100% removal of chlorine (replace every 12 months)

Borrowed from the sellers description @
http://cgi.ebay.com/ws/eBayISAPI.dll...330925357&rd=1