Omnipure - ELF XL 1ML-KDF - 15" x 4" ELF XL-Series 1 Micron Carbon Block & KDF-55 Filter; Cyst & Lead ReductionOmnipure ELF XL Series 15" x 4" 1ML KDF Commercial Carbon Block Filter Extra large format carbon block with KDF 55 media for commercial food service applications requiring cyst, lead, and heavy metal reduction at 1 micron 1 Micron Carbon Block KDF 55 Media Lead Certified Cyst Reduction WHY IT WORKS Four stage filtration for commercial water quality 1 Micron Carbon Block Dense activated carbon block filters particles down to 1 micron while reducing