Seagull RS-1SG Replacement Cartridge Nominal 3800 litres or more capacity at a flow rate of 3.8 litres per minute. Fits X-1 Purifiers Seagull RS-1SG Replacement Cartridge ... £55.00    Seagull RS-2SG Replacement Cartridge Nominal 7600 litres or more capacity at a flow rate of 7.6 litres per minute. Fits X-2K purifiers Seagull RS-2SG Replacement Cartridge ... £95.00    Trav-L-Pure Replacement Cartridge Replacement cartridge for 'Trav-L-Pure' purifier. Normal capacity 475 litres Trav-L-Pure Replacement Cartridge ... £35.00    First Need Replacement Cartridge Replacement cartridge for 'First Need' purifier. Normal capacity 475 litres First Need Replacement Cartridge ... £35.00    Nature Pure Ultrafine Replacement Cartridge Ultrafine Replacement cartridge for all Nature Pure models. 1900 litres or more at flow rate of 1.5 litre per minute. Nature Pure Ultrafine Replacement Cartridge ... £45.00    Spark-L-Pure Replacement Cartridge Aqua-Polish 7 Module. Replacement cartridge for the Spark-L-Pure. Spark-L-Pure Replacement Cartridge ... £280.00    X6 RS-6SG Replacement Cartridge Replacement cartridge for the X6 X6 RS-6SG Replacement Cartridge ... £320.00