Ultimate water filter that fits neatly under your sink for guaranteed micro-biologically safe drinking water. The Twin Superblock filters out dirt, rust, sediment, mud, e-coli, cryptosporidium, giardia, bad taste and odours plus 99%-plus of lead, iron, chlorine, giardia. With touch-flow tap. The unit comes with two cartridges included: the Sediment filter and the Ceramic Pre-Filter. Both cartridges need replacing after a year. We also offer the OMB934 1MPB carbon cartridge as a lower-cost alternative to the Ceramic filter. 5-year warranty Hand-built, factory-tested. Unlike standard sediment filters, the ceramic cartridge can be scrubbed clean with a kitchen scourer if the flow rate slows. All parts included. Needs plumbing in. Cartridges last up to 12 months. Filtration Test Results Australian Water Quality Centre, SA, 15 March 2002 (% reduction) E-Coli (100%), residual chlorine (99%), Bromodichloromethane (99.5%), Bromoform (99.5%), Chloroform (99.5%), Dibromochloromethane (99.5%), zinc, iron, aluminium (all 99%), lead, manganese, cadmium, copper, mercury (all 99.9%) Ultracarb Ceramic Cartridge tested and certified by the Hong Kong Standards and Testing Centre (No: HC109730) and the National Sanitation Foundation (NSF53). Sediment Filter 1 Micron replacement cartridge (Code#OPunderFilter) costs $12. OMB934 1MPB replacement cartridge (Code# OPunderCart) costs $45. Doulton Ceramic 0.2 Micron Pre-Filter replacement cartridge ( Code#MicronPreFilter) costs $79. Undersink filter complete unit (Code#OPunder)costs $327.