The Under Sink water filters installed under the sink, they are plumbed directly into the mains water supply to produce great-tasting drinking water at a fraction of the cost of bottled water. The systems include one sediment cartridge to remove the dirt, sand, dirt and at least one carbon cartridge (it depends on the system). The Carbon will reduce the chlorine and improve the taste and colour of the water. The cartridges are standard 10' (254mm). At the bottom of the product page you can select the optional extras to customize your system.