Flow-Max FM-1-40 40 inch × 2 3/4 inch 1 µ Synthetic Filter Media Pleated Sediment Cartridge The Watts Flow-Max FM-1-40 Filter cartridges outperform wound, spun, melt blown, resin bonded and other "depth" type filter elements because our cartridges are pleated to provide increased surface area and longer life. Savings is realized with extended filter life from the 100% synthetic filter media, which is cleanable on filter cartridges 5 micron and up. Sediment Filtration 1 Micron Nominal 12 GPM (max) Flow Rates vary with micron rating Chemically resistant Pleated Polyester Filtration 100% Cellulose Free Specifications: Filter Application: Cyst, Sediment/Dirt/Rust Cartridge Style: Drop-In Micron Rating (Nominal): 1 µm Manufacturer: Flowmatic Length: 40" (101.6 cm) Outer Diameter: 2.75" Quantity per case: 24 Flow Rate: 16 gpm Initial Pressure Drop: 40 psid Temperature Rating: 40-140 °F Change Frequency: As Needed End Cap Material: PVC, Vinyl-Plastisol Filter Media: Pleated Polyester Inner/Outer Wraps: Polypropylene