DUPURE PB (PURE BLUE) MEMBRANE- CHLORINE TASTE AND ODOR THE EVOLUTION OF WATER NEW - COMMERCIAL LOT COMES WITHOUT A BOX. The PB Membrane is the MIDDLE replacement filter for the Pure Blue (PB) Reverse Osmosis drinking water system. It is recommended to replace this filter every 2-3 years to ensure the highest quality filtering. This does not include the Pre/Post replacement filters. NOS
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