Hi, last year i replaced my old single speed pump to Pentair 2 speed pump. This year i found a problem recently, i schedule my pump to run low speeed from 7:00 Am to 11 PM daily. When the pump is shut off at night, next day the morning i see the water is losing inside the pump housing. Is this normal? Because when prime on low speed, the water is slow and it takes very long to full prime and have air inside the pipe. I don't notify this last year. Could anyone let me know is this normal?