Stage 1
Omnipure Q5621 Carbon Block Filter 10 Micron 2.5 " x 12" - - Replace Every 12 Months
Stage 2
Omnipure Q5672-50FC RO membrane 50 GPD with Flow Control - - Replace Every 24 Months
Stage 3
Omnipure Q5633 Granular Carbon Filter GAC T33 2.5" x 12" - - Replace Every 12 Months