Check the listing for details. iSpring PH100 Compatible RO Filters Kit (Membrane Sold Separately). Condition: New. Listed at 67.95 USD. This is the compatible filter kit for the iSpring PH100 pH+ 6-Stage Under Sink Reverse Osmosis 100 GPD RO Drinking Water Filtration System. RO Membrane is sold separately. INCLUDES: * STAGE 1 - 1x Sediment Pre-Filters (93023) - Replace every 6-12 months or as needed * STAGE 2 - 1x Granular Carbon Pre-Filter (OCB934RO T33) - Replace every 6-12 months or as needed * STAGE 3 - 1x Carbon Block Pre-filters (OMB934-5m) - Replace every 6-12 months or as needed * STAGE 4 - 0x (RO Membrane 655045-00 Sold Separately or with Replacement Kit YSM-ISPG-PH100) - Replace every 24 months * STAGE 5 - 1x Inline Carbon GAC Filter (CL10ROT33-BB) - Replace every 6-12 months or as needed * STAGE 6 - 1x Remineralization Post Filter 2" x 10" (K2548-BB) - Replace every 6-12 months or as needed All filters listed are compatible brand RO products. We do not sell iSpring brand filters. All iSpring brand names, trademarks and logos are property of iSpring. Filters may need to be replaced more often than indicated depending on water contaminant levels and volume of water being treated.