Hi All! We have had a 32000 gallon above ground pool for about 12 years. We use a copper ion system and shock once a week. It always looked great until late last year we started with a little staining. This spring due to a leak in the cover we had to basically refill the pool. The next thing the entire bottom of the pool stained. We applied citric acid and the stains disappeared, for a couple of weeks. Then we hit a period of very hot weather and had algae on the sides of the pool. Has never happened before. Double shocked a couple of times and the algae is gone, but the stain remains. Throughout this, the water has tested fine with the exception of right after the citric acid when we had to use a ph down. Out local pool place has always been helpful in the past but not with this. What are we doing wrong? I’m almost ready to take the whole thing down! I miss my sparkling blue water!