The Water Gem filter provides crystal clear fresh tasting water by reducing chlorine taste and odours using granular activated carbon (GAC). Scale is inhibited by a built-in advanced polyphosphate - helping improve appliance life in hard water areas. Changing filters is exceedingly simple thanks to the supplied push-fit fittings. Filters have a lifetime of up to 6 months / 2,500 litres, which ever comes first. An extremely popular domestic water filter system, which is quick and easy to install.