Stage 1
Suez Purtrex 93023 Sediment Filter 5 Micron 2.5" x 10" - - Replace Every 12 Months
Stage 2
Omnipure OMB934-5m Carbon Block Filter 5 Micron 2.5" x 10" - - Replace Every 12 Months
Stage 4
Omnipure K2533 GAC T33 Granular Carbon Inline Filter 2" x 10" - - Replace Every 12 Months