Check the listing for details. Vertex PWC Filter Replacement Kit with RO Membrane. Condition: New. Listed at 88.97 USD. Filter Replacement Kit with Membrane for Vertex PWC-400, PWC-500, PWC-600, PWC-1000, PWC-1010, PWC-1500, PWC-1800, and PWC-2000 Reverse Osmosis System INCLUDES: * STAGE 1 - 1x Sediment Pre-Filter (K5605-JJ (https://www.espwaterproducts.com/omnipure-2-5-x-12-inline-5-mic-sediment-filter/) ) - Replace every 6-12 months or as needed * STAGE 2 - 1x Carbon GAC Pre-Filter (K5633-JJ (https://www.espwaterproducts.com/omnipure-2-5-x-12-inline-gac-t33-carbon-filter/) ) - Replace every 6-12 months or as needed * STAGE 3 - 1x RO Membrane TFC 50 GPD (555694-00 (https://www.espwaterproducts.com/pentair-50-gpd-tlc-ro-membrane-555694-00/) ) - Replace every 24 months Filters may need to be replaced more often than indicated depending on incoming water contaminant levels and volume of water being treated.