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    Spa nozzles won't suck air ?

    My freind built his own spa pool. The system has 6 spa nozzles 4m3 hr supplied by a dedicated 2 hp pump output 28 m3 hr.. the discharge of the pump is 32mm, reducing to 2 x 50mm pipes which supply the pipe loop at top and bottom. The top nozzles on the array , left and right..pump out water...