Watts Reverse Osmosis Replacement Filter Set 5 pcs with CSM 50 GPD Membrane with 1/4" NPT Inline
Watts Reverse Osmosis 5-Piece Filter Set with CSM 50 GPD Membrane
This Watts replacement kit includes everything you need for a complete RO filter change: sediment pre-filter, dual carbon blocks, post-carbon inline, and a 50 gallon per day CSM thin film composite membrane. Each component is sized at industry-standard 10" x 2.5" dimensions with 1/4" quick-connect fittings for drop-in compatibility with most undersink reverse osmosis systems.
Five-Stage Filtration Sequence
5 Micron Melt Blown Polypropylene Pre-Filter
Removes suspended particles including sand, silt, rust, and scale before they reach downstream filters. Melt blown construction creates a gradient density structure that captures larger particles at the surface and finer sediment in deeper layers.
Replace every 6–12 monthsDual 5 Micron Coconut Shell Carbon Block Filters
Two carbon block stages provide extended contact time for chlorine, chloramines, VOCs, and organic compounds. Solid block construction offers superior mechanical filtration compared to granular media while protecting the membrane from oxidative damage.
Replace every 6–12 monthsCSM 50 GPD Thin Film Composite Membrane
The heart of the system. This 1812 configuration membrane operates at 50 gallons per day production rate and provides up to 98% rejection of dissolved solids, heavy metals, bacteria, and other contaminants down to 0.0001 micron.
Replace every 24–36 months1/4" NPT Inline Granular Activated Carbon
Final polishing stage removes any residual taste or odor from stored water in the pressure tank. Inline format with 1/4" NPT threads installs directly in the output line between tank and faucet.
Replace every 12 monthsFits Most Standard RO Systems
This filter set is designed for undersink reverse osmosis systems using standard 10" x 2.5" cartridge housings and 1812 membrane configuration. The sediment and carbon block filters use industry-standard dimensions with 1" open/close caps. The inline post-filter features 1/4" NPT threaded connections compatible with John Guest, DMfit, and other quick-connect fittings. Confirm your system uses 50 GPD membrane capacity and 1/4" tubing before ordering. Not compatible with countertop or portable RO units.
Watts Reverse Osmosis 5-Piece Filter Set with CSM 50 GPD Membrane
This Watts replacement kit includes everything you need for a complete RO filter change: sediment pre-filter, dual carbon blocks, post-carbon inline, and a 50 gallon per day CSM thin film composite membrane. Each component is sized at industry-standard 10" x 2.5" dimensions with 1/4" quick-connect fittings for drop-in compatibility with most undersink reverse osmosis systems.
Five-Stage Filtration Sequence
5 Micron Melt Blown Polypropylene Pre-Filter
Removes suspended particles including sand, silt, rust, and scale before they reach downstream filters. Melt blown construction creates a gradient density structure that captures larger particles at the surface and finer sediment in deeper layers.
Replace every 6–12 monthsDual 5 Micron Coconut Shell Carbon Block Filters
Two carbon block stages provide extended contact time for chlorine, chloramines, VOCs, and organic compounds. Solid block construction offers superior mechanical filtration compared to granular media while protecting the membrane from oxidative damage.
Replace every 6–12 monthsCSM 50 GPD Thin Film Composite Membrane
The heart of the system. This 1812 configuration membrane operates at 50 gallons per day production rate and provides up to 98% rejection of dissolved solids, heavy metals, bacteria, and other contaminants down to 0.0001 micron.
Replace every 24–36 months1/4" NPT Inline Granular Activated Carbon
Final polishing stage removes any residual taste or odor from stored water in the pressure tank. Inline format with 1/4" NPT threads installs directly in the output line between tank and faucet.
Replace every 12 monthsFits Most Standard RO Systems
This filter set is designed for undersink reverse osmosis systems using standard 10" x 2.5" cartridge housings and 1812 membrane configuration. The sediment and carbon block filters use industry-standard dimensions with 1" open/close caps. The inline post-filter features 1/4" NPT threaded connections compatible with John Guest, DMfit, and other quick-connect fittings. Confirm your system uses 50 GPD membrane capacity and 1/4" tubing before ordering. Not compatible with countertop or portable RO units.
Original: $49.99
-65%$49.99
$17.50Description
Watts Reverse Osmosis 5-Piece Filter Set with CSM 50 GPD Membrane
This Watts replacement kit includes everything you need for a complete RO filter change: sediment pre-filter, dual carbon blocks, post-carbon inline, and a 50 gallon per day CSM thin film composite membrane. Each component is sized at industry-standard 10" x 2.5" dimensions with 1/4" quick-connect fittings for drop-in compatibility with most undersink reverse osmosis systems.
Five-Stage Filtration Sequence
5 Micron Melt Blown Polypropylene Pre-Filter
Removes suspended particles including sand, silt, rust, and scale before they reach downstream filters. Melt blown construction creates a gradient density structure that captures larger particles at the surface and finer sediment in deeper layers.
Replace every 6–12 monthsDual 5 Micron Coconut Shell Carbon Block Filters
Two carbon block stages provide extended contact time for chlorine, chloramines, VOCs, and organic compounds. Solid block construction offers superior mechanical filtration compared to granular media while protecting the membrane from oxidative damage.
Replace every 6–12 monthsCSM 50 GPD Thin Film Composite Membrane
The heart of the system. This 1812 configuration membrane operates at 50 gallons per day production rate and provides up to 98% rejection of dissolved solids, heavy metals, bacteria, and other contaminants down to 0.0001 micron.
Replace every 24–36 months1/4" NPT Inline Granular Activated Carbon
Final polishing stage removes any residual taste or odor from stored water in the pressure tank. Inline format with 1/4" NPT threads installs directly in the output line between tank and faucet.
Replace every 12 monthsFits Most Standard RO Systems
This filter set is designed for undersink reverse osmosis systems using standard 10" x 2.5" cartridge housings and 1812 membrane configuration. The sediment and carbon block filters use industry-standard dimensions with 1" open/close caps. The inline post-filter features 1/4" NPT threaded connections compatible with John Guest, DMfit, and other quick-connect fittings. Confirm your system uses 50 GPD membrane capacity and 1/4" tubing before ordering. Not compatible with countertop or portable RO units.
