I have a Intex above ground pool, the pump that came with it is too small so I have a utility pump in there to help move water around if not just a huge bug trap. We don't use sunscreen or oils and this morning there is a slight oil film on top and feels like oil in the water. What can it be from and how to get rid of????? Is the oil leaking from the sand pump, it is about shot anyway and no where big enough for a 16x32. I removed one utility pump because it stopped working two days ago but still have another one in pool. Please help, pool party on Thursday.