Sonifer 2.5Litre Sonifer Store Water Jug Pitcher with 1 Filter,Blue. 

Permanently absorbs metal and Flow control ensures perfect filtration time. It is economic and convenient and makes better tasting water and food To ensure you enjoy high quality filtered water, replace the filter cartridge at regular intervals. The lifetime of a filter cartridge depends on the local water quality. If your mains water contains a carbonate hardness of 10 -12°dH, the filter cartridge should be replaced after 100 litres of water. If the water is harder or consumption is greater, the lifetime of the cartridge reduces accordingly. The cartridge should be replaced at least every four weeks. Once the cartridge is full it simply stops filtering. It does not leak impurities back into the filtered water