My wife and I purchased a house in January that has an in-ground pool and so far its been a battle. We've had to replace our pump and now we have some serious staining going on along one side of our pool. I've used a chlorine tab to scrub the stain but it didn't remove anything. I've used "Stain Free" treatment and it didn't do anything and I've used a copper stain remover which didn't do anything. A person at the pool store said to use ph down on the stain and it did work in one area but I didn't have enough to treat the larger stain. So I've spent over $60 trying to remove this and nothing as worked so looking for some advice.