Crane Environmental RO-450 Reverse Osmosis System Stages:
Stage 1: The P5 Filter is a 5 Micron Sediment Filter used in the first housing.
Stage 2: The EP-10 5 Micron Carbon Block Water Filter is used in the second housing.
Stage 3: The TFM-18 RO Membrane goes in the housing on top of the RO system.
Stage 4: The CL10ROT33-B inline filter is installed on top of the RO membrane.