We have had a terrible season with water problems and now I have algae again so I want to slam. I have a couple of questions. I understand how to calculate my shock level ( scary) but I don't understand how long do I maintain it at that shock level. I have re read the instructions many times and I still cannot get it. Could you briefly explain? Also what is CC? All the tests I have do not show that. Is it Total available chlorine? I am off to the store to buy more bleach and a test kit. I need to get it under control like yesterday. I did shock it yesterday and see grey debris on the stairs but still it is green but I think I am on the right track but do not want to haphazardly being adding a guessing amount of shock. So I am going the slam method and I want to stay away from the pool stores and just follow you all!