Washbox

1. A system, comprising:

a filter chamber configured to contain media for filtering contaminants from a fluid; and,

an adjustable washbox that defines a media pathway and is configured to receive the media and to wash the contaminants from the media along the media pathway with a counter-current flow of water and wherein the adjustable washbox is further configured to automatically redefine an internal dimension of the media pathway.

2. The system of claim 1 , wherein the redefined internal dimension affects one or more of: a duration that the media is exposed to the counter-current water flow, a rate of the counter-current water flow, or a velocity of the counter-current water flow.

3. The system of claim 2 , wherein the adjustable washbox is configured to adjustably control the rate by controlling a head pressure between the adjustable washbox and the filter chamber.

4. The system of claim 1 , wherein the adjustable washbox further includes a mechanism for reducing build-up of the filter media in the adjustable washbox.

5. The system of claim 4 , wherein the mechanism for reducing build-up of the filter media comprises a vibration mechanism.

6. A system, comprising:

a media bed configured to filter contaminants from a fluid; and,

an adjustable washbox configured to receive media from the media bed and to separate the contaminants from the received media and wherein the adjustable washbox includes an inner portion and an outer portion that define a tortuous media pathway therebetween and the adjustable washbox is automatically adjustable by moving either the inner portion or the outer portion relative to the other of the inner portion and the outer portion to redefine the tortuous media pathway responsive to a change in a rate at which the media is received by the adjustable washbox.

7. The system as recited in claim 6 , wherein the adjustable washbox further comprises a mechanism for controlling head pressure between the media bed and the adjustable washbox.