SimPure T1-100 One Set of Replacement Filter (Not applicable to T1-400 series)Compatible only with SimPure T1 100 Series 4 pack of replacement Filter: 1x PP sediment filter, 1x granular activated carbon filter, 1x RO filter, 1x post carbon T33 filter. 3s Replacement, No Disassembly: Replacement can be completed within 3 seconds with a single twist, and no need to use any tool. We are providing you with the easiest way to install without disassembly.