It is important to replace the pre filters to your RO system annually. Remember for every litre or pure water you use the system has filtered around 5 litres!
3 Stage portable system - 1 x sediment and 1 x CTO carbon cartridge
4 stage undersink system - 1 x sediment and 1 x CTO carbon cartridge
5 stage Undersink system – 1 x sediment, 1 x combination sediment and GAC, 1 x CTO carbon Block
+ Option of adding a post GAC cartridge if replacing the membrane too