Today I had my messy mesquite tree beside my pool cut down while I was at work. Tonight there are numerous stains on the plaster on the ledge near where the tree was, and on the bottom of the pool. It looks like rust stains. Could they have used some rusty shovels to get some tree branches out of the pool? I will pay them tomorrow when they come over for the check, and will ask what happened. I'm glad the tree is gone but didn't expect this. The company is bonded. I have never experienced anything like this since I am a newbie, and have learned how to do everything from you all. Thanks so much for all the info on how to easily keep my pool clean! Can't wait until the water's warm enough to get in!