To provide a feed water system which prevents the water pollution of city water due to the generation of red water and deposition of slime, or the like, within water piping, is inexpensive and does not require labor for maintenance and management.

The high graded water supplying device is constituted by packing reducing filter media up to a prescribed filter medium level into a container body of a cylindrical shape having a water feed port at its under surface and a discharge port at its top surface. A filter medium passage of a hollow cylindrical shape conocentrically constructed in this container is constituted by disposing a bottom end aperture so as to face the upper side of the water feed port of the container, disposing a top end aperture so as to face the discharge port and positioning the same upper than the filter medium level so that the water and the reducing filter media flow convectively. The reducing filter media are formed of granular far IR radiant ceramics. The high graded water supplying device described above is provided with a guide plate flaring to a conical shape in the bottom end aperture of the filter medium passage and is provided with a return plate flaring to a conical shape so a to cover the top end aperture. Further, the water feed port side is provided with an air injection port and the discharge port side is provided with a drain port for cleaning.