Have a problem with the aerator not filling tonite. Turned on kitchen sink and the water was spurting out and was dirty. Went outside and heard the pump going. Looked in aerator and it was empty. Turned off the circuit to pump and filled the aerator with the hose, put on pump and it seems to be working, but can't find why the aerator won't fill. The dial by the contact thing is where it is usually. Don't know what the problem is. Does anyone have any ideas what it could be.