Patent ID: 7186346

Claim:
A low cost oil/grease removal assembly comprising: a container having a bottom, a top, a sidewall, an input end and discharge end, an inlet at the input end adapted to receive effluent from a sink drain and a drain connection at the discharge end, the drain connection being spaced above the bottom and below the top to define a static water level for liquid in the container, a baffle in the container extending downwardly near the discharge end to a level below the static water level to allow water to flow below the baffle from the inlet to the drain connection but retaining oil/grease floating on the water upstream of the baffle, means for intermittently raising the liquid level in the container above the static water level, wherein the means for raising the liquid level is a weir having a pierced portion associated with the drain connection, so that low volume flows pass through the pierced portion of the weir and high volume flows raise the liquid level until liquid flows over the weir, and a port in the container upstream of the baffle at an elevation such that oil/grease floating on water in the container upstream of the baffle can flow from the container out through the port when the liquid level in the container is raised above the static water level.