My pool has been green now for about three days and I can not get it clean. I have added algaecide and shock it to it, but it doesn't seem to be doing anything. I am reading information about adding bleach to your pool, but I have always been told not to this because it would weaken my liner. What should I do. My chlorine level is normal, but my pH is low, which is normal for my pool. I have never had it be in needed range since I have had my pool. Can someone please help me, we are missing some really good pool days.