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Fits AP801 Filter Housing. Easy Cartridge Changeout. 25 Micron Nominal Medium Dirt/Rust Sediment Removal. Sold Individually. Product Details Reduces sediment for cleaner and clearer water Cartridge manufactured using 3M polypropylene process Grooved surface increases total surface area for longer cartridge life as compared to 3M non-grooved surface cartridges Rigid construction helps to reduce sediment “unloading” due to variances in water pressure The 3M™ Aqua-Pure™ Whole House Large Sump Replacement Water Filter Drop-in Cartridge AP811, is a great choice in water filtration. This standard 4.5” diameter by 9.75” length drop-in cartridge is manufacturer tested and verified to reduce sediment down to 25 micron nominal. It’s ideal for larger homes with at least 2.5 bathrooms. The 3M™ Aqua-Pure™ Whole House Large Sump Replacement Water Filter Drop-in Cartridge AP811. Standard 4.5" diameter drop-in cartridge showing grooved surface The 3M™ Aqua-Pure™ Whole House Large Sump Replacement Water Filter Drop-in Cartridge AP811 is a standard 4.5" diameter drop-in cartridge that is manufacturer tested and verified to reduce sediment down to 25 micron nominal. Its rigid construction from our polypropylene manufacturing process, helps capture and retain sediment from within your water. With these features, AP811 is a great choice in water filtration. It's ideal for larger homes with at least 2.5 bathrooms. Features include: Flow rate: up to 20 gpm/75.7 lpm (housing dependent) 6 months (varies depending on local water quality) 4.5 in/11.4 cm by 9.75 in/24.76 cm 25-125 psi/172-862 kPa pressure range 40-100°F/4.4-37.8°C temperature ranges