We have a newly plastered pool under 30 days (almost 30). We have what looks like white water mold but isn't floating in the pool. What can it be? we have tried everything to get rid of it. The pain of scooping it out is tiring. Can't use a robot, can't use anything floating. and we're just scooping and dumping into a bucket. its still there. what do you suggest? Is it plaster? Calcium? Something else?