Patent ID: 8590756

Claim:
A container to hold an initial or refillable volume of fluid, comprising: a housing defining a fluid exit port and an interior to retain the volume of fluid, the interior being oriented during use to deplete the volume of fluid in a direction of gravity toward a bottom surface of the interior; a fluid conduit tube having an inlet opening in the interior and fluidly connected to the fluid exit port to draw from the interior and supply to the fluid exit port a desired concentration of fluid from the volume of fluid; and a float for buoyant positioning on a surface of the volume of fluid, the float connecting to the fluid conduit tube to suspend the inlet opening beneath the surface of the volume of fluid such that as the volume of fluid depletes in the interior over time the float drops as does the inlet opening to draw the desired concentration of fluid from an ever decreasing height above the bottom surface of the interior, wherein the inlet opening extends into the interior at a height above the bottom surface at a predetermined ratio relative to a height of the surface of the volume of fluid above said bottom surface; and the predetermined ratio is about one half over a lifetime of usage of the volume of fluid.