Whilst tap water is safe to consume, it can contain impurities that affect its quality. Temporary water hardness, chlorine, lead, aluminium, lindane (pesticide) and other impurities can alter the taste and appearance of tap water, which in turn may affect food and drinks. The BRITA Water Filter is the most simple, convenient and economical method of effectively reducing impurities and improving the quality of tap water. The result is cleaner, clearer water ideal for hot and cold drinks and cooking. The BRITA cartridge can effectively filter up to 150 litres of tap water which should provide you with all the filtered water you need for 4 -6 weeks. The cartridge should then be replaced .The full range of BRITA jugs and cartridges can be found at Natures Corner.