CUNO SQC 4 Four Stage RO System


The CUNO/WaterFactory 4 stage RO system by 3M uses sediment and GAC pre-filters to reduce chlorine, chlorine by-products and sediment before the membrane filters out impurities larger than .001 microns. The carbon block post filter treats for taste and odor. Be aware that 3M has started to update some of the older part numbers to part numbers starting with 3M but are the same as prior part numbers. You can find and order all your filters at once in our replacement kits below. For less expensive generic replacements, please look at our Omnipure CSM brand.



  • STAGE 1 – Sediment Pre-Filter (47-55706G2 or CSM5651) – Replace Every 12 Months
  • STAGE 2 – Carbon Block Pre-Filter (47-9298G2 or CSM5621 or 3MROP412) – Replace Every 12 Months
  • STAGE 3 – RO Membrane TFC 36 GPD (66-4706G2 or CSM5672 or 3MROM413) – Replace Every 24 Months
  • STAGE 4 – Carbon GAC Post Filter (47-55704G2 or CSM5640) – Replace Every 12 Months

PDF iconCUNO-WaterFactory SQC4 Installation Manual