Watts Premier W-2R-2Y-1B-1G Ro Pure Replacement Filter Plus Membrane, 6-packWatts Premier Complete Replacement Kit W 2R 2Y 1B 1G RO Pure 6 Pack Filter Set Full year replacement bundle with 50 GPD membrane and four stage carbon filtration NSF Carbon 50 GPD Membrane 5 Micron Filtration Watts Premier 105331 This six pack replacement kit (model W 2R 2Y 1B 1G) includes everything needed to maintain a Watts Premier RO Pure system for a full filtration cycle. You get two sediment pre filters, two carbon block pre filters, one 50