Had Polaris rebuilt last summer. Then wouldn't

Thank you for posting your question here on Fixya.com.

Have you cleaned or replaced the in-line filter found at the wall socket? How about the pressure valve found just after the wall socket...is it fully open, possibly allowing too much water to bypass the cleaner and return to the pool?

How about the main filter? If overall system flow is reduced because of a dirty main filter the booster pump would be 'boosting' lower than normal pressure so the net result at the cleaner is reduced as well. A cartridge filter is especially problematic here. It can look clean after rinsing it but after enough use the element needs to be replaced to restore original system flow.

Are there multiple return paths for water back to the pool that have valves? Can you throttle down a return to, say a spa for example, to force more water to the dedicated line for the cleaner?

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!

John