Check the listing for details. Ultima Green RO 5 Compatible Filter Kit with RO Membrane. Condition: New. Listed at 136.96 USD. 1-Year Filter Replacement Kit with High Efficiency Encapsulated RO Membrane for the Ultima GREEN RO 5 Stage Reverse Osmosis System INCLUDES: * STAGE 1 - 1x Sediment Pre-Filter (93023) - Replace every 6-12 months or as needed * STAGE 2 - 1x Carbon Block Pre-Filter (OMB934-5M) - Replace every 6-12 months or as needed * STAGE 3 - 1x Carbon Block Pre-Filter (OMB934-5M) - Replace every 6-12 months or as needed * STAGE 4 - 1x Encapsulated RO Membrane GRO-50EN 50 GPD (4002574) - Replace every 24 months * STAGE 5 - 1x Inline Carbon GAC Post Filter 2" x 10" (CL10ROT33-BB) - Replace every 6-12 months or as needed Filters may need to be replaced more often than indicated depending on incoming water contaminant levels and volume of water being treated.