Flow Rate: 0.5gpm(1.9Lpm) Capacity: 30,000gallons Working Pressure: 0.21-0.69Mpa Working Tempeture: 4-38 Feature: *Maintenance-free: No need to change the cartridge before reach the capacity. *High technology models: American patented high-tech KDF55 process media, effectively removes heavy metal, chlorine, hydrogen sulfide, controls bacteria & scale.