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 CL10ROT33 Inline Carbon Filter GAC 5 Mic 2" x 10" - - Replace Every 12 Months