I have metal stains all around the pool. It can mostly be seen when the water level lowers a bit. It is from the waterline down about 18". I am on city water and I don't think we have metals in the water. Before I got the pool working this year, it had been sitting for four years unused. When I started up the system this year, I did run the water through the heater for about one week. The heater does have a slow leak so I ended up taking it out of the loop.
So if it is from the heater and not water supply, what should I do? I don't want to have to use sequestrates for now on if I don't have to. Would I have to remove the water and replace? Can I try the AA treatment and then just see what happens.
I tested the stains with vit c and it did remove/lighten it.
Also, how can I test our water supply for metals? Maybe the water dept. can tell me?