Check the listing for details. Vertex Water Cooler Filter Kit (RO Membrane Sold Separately). Condition: New. Listed at 45.98 USD. Filter Replacement Kit for Vertex PWC-400, PWC-500, PWC-600, PWC-1000, PWC-1010, PWC-1500, PWC-1800, and PWC-2000 Reverse Osmosis System (RO Membrane Sold Separately) The YS-VERPWC is also the 1 Year replacement kit for PWC-400, PWC-500, PWC-600, PWC-1000, PWC-1010, PWC-1500, PWC-1800, and PWC-2000 on standard filtration systems without a membrane. INCLUDES: * STAGE 1 - 1x Sediment Pre-Filter (K5605-JJ) - Replace every 6-12 months or as needed * STAGE 2 - 1x Carbon GAC Pre-Filter (K5633-JJ) - Replace every 6-12 months or as needed * STAGE 3 - 0x (RO Membrane 555694-00 Sold Separately or with Replacement Kit YSM-VERPWC) - Replace every 24 months Filters may need to be replaced more often than indicated depending on water contaminant levels and volume of water being treated.