The filters trace some impurities such as certain herbicides and pesticides that can be found in tap water and reduces lead and copper. The filter protects 50% better against limescale. Constructed with a super fine mesh filter with particle retention which works well with water from older pipework. Made from sustainable 50% bio-based plastic. Compatible with all current BRITA water filter jugs, each of the filter cartridges replaces up to 150 1 litre plastic bottles of water.