Patent ID: 6916152

Claim:
A method of providing a discharge head height that is nearly twice that of a single impeller centrifugal sewage pump, while drawing nearly the same amount of electrical power as a single impeller pump, comprising the steps of: drawing sewage into a first impeller chamber with a first centrifugal induced flow impeller, said first centrifugal induced flow impeller having downward facing vanes, the sewage including solid waste, pushing the sewage out of said first impeller chamber with said first centrifugal induced flow impeller, said first impeller chamber having a substantially volute shape; pushing the sewage into a second impeller chamber with a second centrifugal induced flow impeller, pushing the sewage out of said second impeller chamber with said second centrifugal induced flow impeller, said second impeller chamber having a substantially volute shape; and providing a motor for rotating said first centrifugal induced flow impeller and said second centrifugal induced flow impeller, said motor being rotated with electrical power.