I had some tree work done today. One of the trees they cut was a diseased Bradford Pear and the top landed on the corner of the pool dropping what looks like seed pods and leaves in the water. They failed to tell me when it happened. About three hours later I scooped it out but it left a lot of stains on the plaster. Brushing did not help. I read here to raise the Chlorine level but it did not say by how much. I run my CYA at 70 and my CL at 4 consistently. Should I double it? Would it hurt the plaster to just use a puck and hold it over each spot until it disappears? It is probably 20-30 spots about the size of a half dollar. I am having a pool party this weekend and it looks really bad. Thanks!