Patent ID: 7682504

Claim:
A water treatment unit for treating water within a recirculated marine aquaculture systems fishery, the treatment unit comprising: a first chamber having a floor, a ceiling situated above the floor, and a filtering wall connecting the floor and ceiling, the filtering wall permitting water to flow into the first chamber while excluding particulate materials, a second chamber situated above the first chamber having a base, a sidewall extending upward from the base, and a top, the second chamber having at least one water outlet in a lower portion of the second chamber, and an air inlet in an upper portion of the second chamber, a stand pipe coupled between the first chamber and the second chamber, the stand pipe having a lower end opening into the first chamber, and an upper opening adjacent to the top of the second chamber, and an impeller connected to the stand pipe to move water from the first chamber through the upper opening into the second chamber, thereby creating a head within the second chamber forcing water out through said water outlet.