3M Water Factory SQC3 RO Filter Replacement Kit -Membrane Not IncludedCUNO Water Factory SQC3 Compatible Reverse Osmosis Filter Replacement Bundle (RO Membrane Sold Separately) INCLUDES: STAGE 1 1x Sediment Pre Filter (3MROP411) Replace every 6 12 months or as needed STAGE 2 0x (RO Membrane 3MROM413 Sold Separately or with Replacement Kit YSM CUNSQC3) Replace every 24 months STAGE 3 1x Carbon Block Post Filter (3MROP416) Replace every 6 12 months or as needed *Filters may need to be replaced more often than indicated