This is a low cost, high quality alternative to 3M Cuno CFS9720-EL water filter. This filter is rated for an impressive 20,000 gallon capacity at 2.0 gallon per minute flow rate. The Omnipure C ELF XL-5M-KDF-L-P is comprised of granulated activated carbon infused with lead removal natural zeolites and KDF media. These three ingredients are compressed to a rigid carbon block. The core is then filled with polyphosphate scale inhibitor to complete the construction. This design provides dirt sediment filtration, taste odor chlorine adsorption, lead reduction, scale inhibition and microbial control.