20'' CTO Filter Cartridge 1.20 inch CTO Carbon Filter 2.The prodact are have liability insurance 3.Filter Media: Coconut Shell Carbon 4.Replaced every 6-9 months depends on water quality 20'' CTO Filter Cartridge Model No.:20'' CTO Type:20'' CTO Maximum Flow:1.5GPM Maximum Pressure:125PSI Maximum Temperature:65degree C Replaced period:Every6-9months,depends on water qulailty