My pool has two skimmers, topside deep end and bottom of pool deep end. The bottom one works fine but the top one not only has no suction but it is like the pump is sucking water from the pump. Not all the time just cavitates. It pushes to the filter then sucks from the filter! It was working fime two weeks ago> any idea!

Who was the pool manufacturer? Anthony or sylvan or etc? If you can tell me that then I can help you