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Ok folks - thanks for all the responses. I found the problem - a pool sweep version of a 'kidney stone': There are two small vertical water jet spouts on the interior of the central shaft that apparently serve 2 purposes: Obviously, to cause a stream of water upward that will suck up debris...

I'm having a problem with my Polaris 280. It seems to be too buoyant. When in operation, it tends to leave the bottom of the pool and swim around in the 'air'. When not in operation, it sits with the rear end off the bottom of the pool. If I take it out and throw it back in the pool, it sinks...