Water purification system and method for efficiently and reliably removing various pollutants different in size

A water purification system comprising:

• a cylindrical first filter positioned in a flow of raw water for filtering said raw water to produce filtered water, said first filter including conductive activated carbon fiber, and having a plurality of water passages through which said raw water flows, each of said water passages of the first filter having a first diameter;
• a column shaped second filter downstream of said first filter for filtering said filtered water, said second filter having a plurality of water passages through which said filtered water flows, each of said water passages of the second filter having a second diameter smaller than said first diameter, said second filter being inserted in said first filter;
• voltage applying means connected to said first filter for applying an electric voltage to said first filter to heat said first filter to a temperature capable of destroying bacteria captured by said first filter;
• and
• a thermally conductive member extending from said first filter to said second filter such that heat from said first filter conducts through said member to heat said second filter to a temperature capable of destroying bacteria captured by said second filter.