Specialized blend of resin targeted to reduce hardness and alkalinity. Designed speci?cally for espresso applications Provides 422 gallons of hardness reduction @ 10.5 GPG (grains per gallon) with a service ?ow rate of .5 gpm Carbon block integrated to reduce taste and odor Patented Quick Connect valve-in-head design simultaneously shuts off and vents water with .25 turn allowing for simple and trouble-free cartridge change-outs .375 FNPT horizontal inlet and outlet ports allow direct or easily adaptable connections to existing plumbing lines System maximum operating pressure is 125 psi (862 kPa) and operating temperature 100F (38C)