Ensure your pool vacuum hose is connected properly and cannot come loose in operation. If you do not have a ‘snug fit’ it can create air pockets affecting the performance of your automatic pool cleaner or manual vacuum. Before connecting your pool hose to the skimmer, ensure the filtration (pump) system is turned off. It is important you bleed the air from the pool hose by submerging each length of the hose into the water to ensure they are full of water before turning the pump on. If you do not do this, it can create an air gap in your pool hose line which can affect the suction back to the cleaner or vacuum head.