I have worked hard and added all chemicals as instructed by Leslie where I bought chemicals, to get my water chemistry right. There seems to be some kind of tension on the water that does not let anything sink. I have shocked pool many times to kill algae. I have tried liquid floculant a couple days ago and ALUM today and it looks like scum floating on top of my pool (and the water is still green/yellow)

I have let it sit 30 hours so far (after recirculating with last floculant add) and nothing is sinking. I have a 20,000 gal pool and I guess I was lucky the first year I uncovered it after buying the house....I threw floculant in and in 2 days I had clear water. I of course vacuumed to waste and got my water chemistry right immediately. I have used over $400 in chemicals so far and need to clear this up.

Please help!