Plonk a few charcoals in a jug of water and leave it for a while and it will slowly filter out impurities such as chlorine and chloramines making your water tastier and free from that rather rough tap water odour.It will also pump in natural minerals like potassium and magnesium and it is worth knowing that 1g of high quality bamboo charcoal has a surface area equivalent of up to 3 tennis courts.