This filter system has now been discontinued. We do have a suitable alternative that can be found here - Everpure 4C Under Sink Filter System – Replacement Kit for BW100/BW400 Systems The Everpure BW100 is a particularly effective filter for drinking water systems with sub-micron filtration down to 0.5 Microns offering a superior level of chlorine, taste and odour reduction. The BW100 is a suitable replacement for Culligan and BWT DW400 / DW400F filter cartridges. The BW100 is also certified (NSF/ANSI Standard 42 & 53) to reduce chlorine, tastes and odours as well as cysts such as Cryptosporidium and Giardia. Compatible with Pentair Everpure BW filter head as well as Culligan and BWT DW filter heads. Specifications Replacement Cartridge: Everpure BW100 Model Code: EV966816 Capacity: 5,670 litres Flow Rate: 1.9 litres p/m (max) Operating Pressure: min 0.7 bar (10 psi) / max 8.62 bar (125 psi) Operating Temperature: min 2°C / max 38°C Dimensions: 50.8 cm x 12.7 cm