Thank you for posting your question here on Fixya.com. It is a pressure side cleaner...the booster pump only boosts the main pumps output pressure so much. Lowering the main pump output, the booster WILL NOT compensate by increasing its output. Lowering the pressure to the cleaner head will cause what you describe. Turn the new pump up to full speed to clean the pool then down lower to circulate water for chemical balance and maintenance. If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!
John
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