Stage 1
Microline S7028 Sediment/Carbon Filter 2" x 11.5" - - Replace Every 12 Months
Stage 2
Microline S1227RS TFC Reverse Osmosis Membrane 25 GPD - - Replace Every 24 Months
Stage 3
Microline S7025 Carbon Filter GAC 2" x 12 - - Replace Every 12 Months