I have a problem. My pool is a SWG system. We went to a pool store and told the guy we were getting ready to start but the water had turned green. He sold us some shock 1lb and algaecide. Told us to add these two products at least an hour apart. Then the next day add the 4 bags of salt. We didn't that and two days later back to square 1 with green water. I have read on this site about using bleach just need to know how much?