I am really stumped too. The only thing I can think of is that the filter you have is not strong enough to handle all that is going on with your water. Everytime something small changes, it seems that the filter can't handle it. You seem to have a lot of sequesterer in the water - but some of them add phospates, which is food for algae - I feel like I am reaching for straws here - I just don't know. I just got a new product called "metal magic" from proteam. It is supposed to change the metals into a salt crystal - which can then filter out or be vacuumed to waste. I haven't tried it yet, because I just got it - I also am not having any staining right now, but I have a friend who does, and Iwill try it on her pool. I will be away this week-end, so I won't have any results till next week. I am so sorry for your trouble - It is also getting expensive for you too, so I can understand the frustration. I am sorry that I can't give you any other advice that comes from experience - just ideas on what can be happening. I would just keep the filter running 24/7 and hope that the sequester that you have in there will eventually bond to the metals, and the chlorine will do it's job, and the green will clear.