Watts - FPMB Series - 20" x 4.5" Flow-Pro Melt Blown Sediment Filter
20" x 4.5" Flow-Pro Melt Blown Sediment Filter
Polypropylene melt blown construction for reliable sediment removal in residential and commercial applications
Engineered for consistent sediment removal
Melt Blown Polypropylene
Pure thermally bonded construction creates a depth filter with no binders or additives that could leach into your water
High Dirt Holding
Graduated density design traps sediment throughout the entire filter depth, extending service life and maximizing capacity
Temperature Tolerant
Rated to 140°F for compatibility with hot water applications and thermal sanitization cycles
Chemical Resistance
Polypropylene withstands exposure to chlorine, acids, and other water treatment chemicals without degradation
Flow-Pro Design
Optimized for flow rates from 2-8 GPM depending on micron rating, balancing filtration efficiency with pressure drop
Technical details
| Dimensions | 20" length x 4.5" diameter |
| Media | Melt blown polypropylene (food grade) |
| Max Temperature | 140°F / 60°C |
| Max Pressure | 40 PSID |
| Flow Rate | 2-8 GPM (varies by micron rating) |
| Change-Out | Recommended at 30 PSID pressure drop |
| Packaging | Individually shrink wrapped |
Fits standard 20" x 4.5" Big Blue housings
The Watts FPMB Series is designed for use in all standard 20-inch Big Blue filter housings with 4.5-inch inner diameter. Compatible with Watts housings and equivalent systems from other manufacturers. Available in multiple micron ratings for pre-filtration of reverse osmosis systems, beverage equipment, electronics manufacturing, plating solutions, and potable water applications. Available in Standard, Full-Flow, and grooved configurations depending on your specific application requirements.
Replacement schedule
Residential Use
Replace when pressure drops 30 PSI or water flow noticeably decreases. Sediment load and water quality determine actual service life.
Commercial / High-Volume
Monitor pressure differential frequently in commercial applications. Heavy sediment loads require more frequent replacement.
RO Pre-Filtration
Replace before pressure drop impacts RO membrane performance. Protecting downstream equipment is critical.
No Leachables
Food grade polypropylene with no binders or adhesives
Cost Effective
Affordable protection for expensive downstream equipment
Wide Application Range
Multiple micron ratings for varied filtration needs
Watts Quality
Manufactured to consistent specifications by a trusted brand
20" x 4.5" Flow-Pro Melt Blown Sediment Filter
Polypropylene melt blown construction for reliable sediment removal in residential and commercial applications
Engineered for consistent sediment removal
Melt Blown Polypropylene
Pure thermally bonded construction creates a depth filter with no binders or additives that could leach into your water
High Dirt Holding
Graduated density design traps sediment throughout the entire filter depth, extending service life and maximizing capacity
Temperature Tolerant
Rated to 140°F for compatibility with hot water applications and thermal sanitization cycles
Chemical Resistance
Polypropylene withstands exposure to chlorine, acids, and other water treatment chemicals without degradation
Flow-Pro Design
Optimized for flow rates from 2-8 GPM depending on micron rating, balancing filtration efficiency with pressure drop
Technical details
| Dimensions | 20" length x 4.5" diameter |
| Media | Melt blown polypropylene (food grade) |
| Max Temperature | 140°F / 60°C |
| Max Pressure | 40 PSID |
| Flow Rate | 2-8 GPM (varies by micron rating) |
| Change-Out | Recommended at 30 PSID pressure drop |
| Packaging | Individually shrink wrapped |
Fits standard 20" x 4.5" Big Blue housings
The Watts FPMB Series is designed for use in all standard 20-inch Big Blue filter housings with 4.5-inch inner diameter. Compatible with Watts housings and equivalent systems from other manufacturers. Available in multiple micron ratings for pre-filtration of reverse osmosis systems, beverage equipment, electronics manufacturing, plating solutions, and potable water applications. Available in Standard, Full-Flow, and grooved configurations depending on your specific application requirements.
Replacement schedule
Residential Use
Replace when pressure drops 30 PSI or water flow noticeably decreases. Sediment load and water quality determine actual service life.
Commercial / High-Volume
Monitor pressure differential frequently in commercial applications. Heavy sediment loads require more frequent replacement.
RO Pre-Filtration
Replace before pressure drop impacts RO membrane performance. Protecting downstream equipment is critical.
No Leachables
Food grade polypropylene with no binders or adhesives
Cost Effective
Affordable protection for expensive downstream equipment
Wide Application Range
Multiple micron ratings for varied filtration needs
Watts Quality
Manufactured to consistent specifications by a trusted brand
Original: $62.40
-65%$62.40
$21.84Description
20" x 4.5" Flow-Pro Melt Blown Sediment Filter
Polypropylene melt blown construction for reliable sediment removal in residential and commercial applications
Engineered for consistent sediment removal
Melt Blown Polypropylene
Pure thermally bonded construction creates a depth filter with no binders or additives that could leach into your water
High Dirt Holding
Graduated density design traps sediment throughout the entire filter depth, extending service life and maximizing capacity
Temperature Tolerant
Rated to 140°F for compatibility with hot water applications and thermal sanitization cycles
Chemical Resistance
Polypropylene withstands exposure to chlorine, acids, and other water treatment chemicals without degradation
Flow-Pro Design
Optimized for flow rates from 2-8 GPM depending on micron rating, balancing filtration efficiency with pressure drop
Technical details
| Dimensions | 20" length x 4.5" diameter |
| Media | Melt blown polypropylene (food grade) |
| Max Temperature | 140°F / 60°C |
| Max Pressure | 40 PSID |
| Flow Rate | 2-8 GPM (varies by micron rating) |
| Change-Out | Recommended at 30 PSID pressure drop |
| Packaging | Individually shrink wrapped |
Fits standard 20" x 4.5" Big Blue housings
The Watts FPMB Series is designed for use in all standard 20-inch Big Blue filter housings with 4.5-inch inner diameter. Compatible with Watts housings and equivalent systems from other manufacturers. Available in multiple micron ratings for pre-filtration of reverse osmosis systems, beverage equipment, electronics manufacturing, plating solutions, and potable water applications. Available in Standard, Full-Flow, and grooved configurations depending on your specific application requirements.
Replacement schedule
Residential Use
Replace when pressure drops 30 PSI or water flow noticeably decreases. Sediment load and water quality determine actual service life.
Commercial / High-Volume
Monitor pressure differential frequently in commercial applications. Heavy sediment loads require more frequent replacement.
RO Pre-Filtration
Replace before pressure drop impacts RO membrane performance. Protecting downstream equipment is critical.
No Leachables
Food grade polypropylene with no binders or adhesives
Cost Effective
Affordable protection for expensive downstream equipment
Wide Application Range
Multiple micron ratings for varied filtration needs
Watts Quality
Manufactured to consistent specifications by a trusted brand
