I have been using the troublefreepool method for about a month and a half now, and have virtually eliminated the black algae problem I have had for the last four years. Of course, my pool looks almost as good as it did when it was first built. Well, I should say, looked as good until seeds, I think, have been getting in my pool and staining the plaster. Have been keeping fc between 3-6 and have had no algae problems, but this amount of bleach has had seemingly no effect on the stains which started showing up about two weeks ago. HELP!