Franklin 20" x 4.5" OD Spun Poly Filter Cartridge, NSF 42 Certified (FWPS Series)

Product Overview The Franklin 20" x 4.5" OD FWPS Series Spun Poly Filter Cartridge delivers high-efficiency sediment filtration for demanding residential, commercial, and industrial water treatment applications. Manufactured from thermally fused polypropylene fibers, this cartridge provides reliable particulate reduction without the use of adhesives, binders, or surfactants. Its multi-density three-layer construction captures larger contaminants near the outer surface while finer inner fibers trap smaller particles deeper inside the cartridge. This graduated density structure improves filtration efficiency, increases contaminant-holding capacity, and extends cartridge service life. The extended 20" Big Blue configuration offers higher flow performance and longer operating cycles, making it ideal for systems with elevated water demand or higher sediment loads. Key Features Extended 20" cartridge for increased filtration capacity Large 4.5" OD Big Blue design supports higher flow rates Three-layer density structure improves contaminant capture 100% polypropylene construction for broad chemical compatibility Thermal-bonded manufacturing without adhesives Low pressure drop and long service life Will not add taste, odor, or color to water NSF 42 certified for potable water applications Recommended Applications Whole-house water filtration Commercial water systems Reverse osmosis pre-filtration Industrial process water Chemical processing Food & beverage production Water purification systems Specifications Specification Detail Series FWPS Series Cartridge Length 20" Outside Diameter 4.5" Media 100% Melt-Blown Polypropylene Construction Thermal Bonded Max Operating Temperature 65°C (150°F) Nominal Replacement Pressure Drop 1.5 Bar (22 PSI) Maximum Pressure Drop @ 20°C 3.2 Bar (46.4 PSI) Maximum Flow Rate 12–20 GPM Micron Ratings Available 1, 5, 20, 50 Micron Certifications NSF 42, FDA CFR Title 21 Frequently Asked Questions Why choose a 20" filter cartridge? A 20" cartridge provides greater dirt-holding capacity and longer service intervals compared to standard 10" filters. What makes the three-layer density design effective? The graduated fiber density traps larger particles on the outside while finer fibers inside capture smaller contaminants, improving efficiency and extending cartridge life. Is polypropylene chemically resistant? Yes. Polypropylene is highly resistant to many chemicals and process fluids, making it suitable for a wide range of applications. Will this filter affect water taste or smell? No. The polypropylene media will not add taste, odor, or color to the water. Can this cartridge be used before an RO system? Yes. FWPS Series cartridges are commonly used as pre-filtration stages to protect reverse osmosis membranes from sediment contamination.