Drinking water supply container having a removably mounted filter device

Claim 1

A container assembly for a drinking fluid comprising: a. a watertight container having a neck at its upper end and an annular shaped cap removably mounted on said neck and b. a filter device extending into said container through said neck for providing a passageway for air entering said container and for filtering drinking fluid exiting said container, said filter device including a housing having an elongated tubular shaped outer wall and an inner wall, said inner wall being shaped to divide said filter device into an upper chamber and a lower chamber, a quantity of filter media disposed in said lower chamber, upper and lower disc shaped screens at the top and bottom, respectively, of said lower chamber for holding the quantity of filter media in said lower chamber, said drinking fluid entering said lower chamber through said lower screen and exiting said lower chamber through said upper screen, said inner wall being shaped to define a sipping tube extending down through said upper chamber to said lower chamber for enabling drinking fluid in said container to be extracted therefrom by suction, the flow path of the lower chamber being about equal to the length of the lower chamber, the dry set bed length of the quantity of filter media being less than the length of the filter device and being at least about 7 times the inside diameter of the lower chamber.