I have an inground (about 18,000 or so gallons) salt water generated pool. right now my water is cloudy in the deep end and like a blue green color. We added shock, salt and stuff to adjust the Ph Level. upon vacuuming it started to blow white cloudy stuff out of the jets. This happens to us every year. What causes this to happen? This year though we also have foamy stuff and like an oily sheen on the water's surface.