Direct-filtration systems
Under-sink water filter replacements
Start with the filtration-system brand and model printed beneath the sink—not the faucet style or cartridge color.
Find the system label firstLook on the filter head, mounting bracket or cartridge housing. Photograph every model and part number before removing anything.
All filter typesVerified replacement matches
Browse 8 replacements matched to named under-sink systems using manufacturer information.
Aquasana Claryum 2-Stage replacement set
AQ-5200R / AQ-C2-RFits: AQ-5200, AQ-6200
View fit details and buying option →AquasanaAquasana Claryum 3-Stage replacement set
AQ-5300R / AQ-C3-RFits: AQ-5300, AQ-6300
View fit details and buying option →AquasanaAquasana Claryum 3-Stage Max Flow replacement set
AQ-5300+R / AQ-C3M-RFits: AQ-5300+, AQ-6300M
View fit details and buying option →CulliganCulligan EZ-Change premium replacement cartridge
RC-EZ-4Fits: US-EZ-4, IC-EZ-4, RV-EZ-4
View fit details and buying option →CulliganCulligan EZ-Change advanced replacement cartridge
RC-EZ-3Fits: US-EZ-1, US-EZ-3, US-EZ-4, IC-EZ-1, IC-EZ-3, IC-EZ-4, RV-EZ-3
View fit details and buying option →Pentair EverpurePentair Everpure H-300-NXT quick-change cartridge
EV927441Fits: H-300-NXT
View fit details and buying option →Pentair EverpurePentair Everpure H-300 quick-change cartridge
EV927072Fits: H-300
View fit details and buying option →3M Aqua-Pure compatiblePERCOLA replacement cartridge for the 3M full-flow system
3MFF101 compatibleFits: 3MFF100, 3M FF100
View fit details and buying option →Under-sink filter guidance
Choose, identify and replace the right filter
Use these practical guides to identify your system type, find its model number and understand when each cartridge should be replaced.
What to verify before buying
- The complete filtration-system model
- The part number on the installed cartridge
- Whether the system uses one cartridge or multiple stages
- The manufacturer’s current replacement interval