Check the listing for details. iSpring PH100 Compatible RO Filter Kit with RO Membrane. Condition: New. Listed at 122.94 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. 1-Year Filter Replacement Kit includes: * STAGE 1 - 1x Sediment Pre-Filter (93023) - Replace Every 12 Months * STAGE 2 - 1x Carbon GAC Pre-Filter (OCB934RO T33) - Replace Every 12 Months * STAGE 3 - 1x Carbon Block Pre-Filter (OMB934-5m) - Replace Every 12 Months * STAGE 4 - 1x RO Membrane TLC 100 GPD (655045-00) - Replace Every 24 Months * STAGE 5 - 1x Inline Carbon Post Filter 2" x 10" (CL10ROT33-BB) - Replace Every 12 Months * STAGE 6 - 1x Remineralization Post Filter 2" x 10" (K2548-BB) - Replace Every 12 Months 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.