I have yellowish Brown formations on diamond brite wall. They are not stains but looks like something is growing. They are hard, small irregular shapes, and do not brush off. I have tried a chlorine tablet but that does nothing and have rubbed vitamin C tablets and that seems to break it up some of the spots but not all of them. It does not dissolve it. I am assuming it is metal.
Am I right is assuming it is metal, and what kind?
How did I get these? I do have well water for my sprinklers but would a small amount of overspray cause this? I was thinking that during the 4th of July holiday, my pool had some spent up fireworks fall in from being air borne.
What are the procedures to get rid of these stains/growth and prevent them from appearing?
BTW, new pool finished in April and PH still going up, I add about 1.5 gals of muriatic acid weekly. My PH has been above 8.0 a couple of times and my TA has been around 70 for the first couple of months. My CYA had dropped below 30 after emptying water a couple of times last month from the rain.
My numbers now are:
Salt 1800 (I use BBB)