Check the listing for details. RainSoft 9596 Compatible RO Filter Kit (Membrane Sold Separately). Condition: New. Listed at 31.97 USD. 1-Year Filter Replacement Kit for RainSoft 9596 Reverse Osmosis System (RO Membrane Sold Separately) INCLUDES: * STAGE 1 - 1x Sediment Pre-Filter (93023) - Replace Every 12 Months * STAGE 2 - 1x Carbon Block Pre-Filter (OMB934-5M) - Replace Every 12 Months * STAGE 3 - 0x (RO Membrane TFC-RS9-22 Sold Separately or Included with Replacement Kit YSM-RS9596) - Replace Every 24 Months * STAGE 4 - 1x Carbon GAC Post Filter (CL6ROT33-BB) - Replace Every 12 Months Note: If your Rainsoft reverse osmosis system is from 2013 or newer, it most likely is the Ultrefiner II. The Ultrefiner II requires proprietary filters that must be purchased from a Rainsoft dealer. Conversion kits to generic non-OEM replacement filters are available. Filters may need to be replaced more often than indicated depending on incoming water contaminant levels and volume of water being treated.