KDF Filter combines a special high purity zinc and copper alloy with Activated Carbon. This method is called REDOX or oxygen reduction; to remove contaminants such as aluminium, sulphur, iron and heavy metals for example mercury, lead, and arsenic. It also removes fungus and algae and is bacteria static. KDF is highly effective in treating drinking water. It also removes man made chemicals including chlorine and reduces scale build up in tea kettles while removing bad taste, colour and odours. KDF also prolongs the Activated Carbon life span.