Did you know tap water contains minerals, however it can contain taste impairing substances such as Chlorine and organic impurities. The new BRITA MicroDisc is made of activated natural carbon from coconuts and contains millions of pores, it securely locks away taste impairing substances along with herbicides, pesticides, hormones and microparticles (if present) – but leaving in key minerals such as calcium and magnesium valuable minerals to great tasting BRITA filtered water.