I read a recent C-Net article that described a new water filter that is now available from Hammacher Schlemmer that can filter up to 25,000 gallons (94,500 L) of water. It is claimed that this is enough for a family of four for a period of 10 years!

Our standard filters have a service life of around 12,000 litres, however although the filter capacity is important, another key aspect is that over time, water systems can develop bacterial growth and should be regularly sanitised and cleaned. Filters are no exception and should be replaced regularly to avoid bacterial build up - regardless of filter capacity.

Personally I would never want to drink from a water filter that has been on a system for 10 years.