I have a Barracuda Beta pool sweep running through the skimmer to a 1.5 HP pump. My problem is the Barracuda's diaphragm is so small it doesn't allow enough water flow to satisfy the pump requirements and so it cavitates and fills with air. I have three possible areas where a suction side air leak can occur: two unions and the pump strainer basket lid. I have checked the o-rings and tightened the two unions and have inspected and cleaned the strainer basket o-ring. I can run just the Barracuda hose in the water and everything works fine, as soon as I hook the hose to the Barracuda, the water flow immediately drops significantly and the pump starts cavitating seconds later. After about 10-15 minutes the Barracuda stops working and the pump is just about running dry. According to the pump curve chart, a 1.5 HP pump is more than adequate to turn over 12K gallons of water several times in 24 hours. My question is, should I replace the 1.5 HP motor with a smaller one to lessen the amount of water the pump requires or is there another suction side pool sweep that will allow more water flow than the Barracuda?