The Brita Maxtra Pro Limescale Expert is supplied as a pack of 6 filter cartridges. The filters trace some impurities such as certain herbicides and pesticides that can be found in tap water and reduces lead and copper. The pack of 3 filters provide fresh filtered water and impares substances such as chlorine that can impair the taste. 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.