Specification: Omnipure-OMB200-1M-P MIcron Rating >95%@5 m Filter Dimensions 2.5" O.D.x1.25"I.D.x20L Chlorine Reduction>95% 20,000 Gallons @2.0 GPM 6 Months Initial P <2.0 PSID @2.o GPM Carbon Weight 1.5lbs Carbon Type- Activated Coconut Carbon