Stains On Plaster

duraleigh · Postby **duraleigh** » Tue 31 Aug, 2010 09:30

Probably, about now. Most organic stains start to lighten from elevated chlorine in the first day and continue to improve slowly.

If it's removed by the addition of acid, it's a pretty decent bet it's metal.

That from my other post is influencing me, too. Organic stains that I am aware of are not affected by the application of acid so I would think it to be metal.

One thing we haven't explored is calcium scale (which is a metal, too!) Are the stains rough at all? Have you contacted your re-plasterer and asked his advice?

fields · Postby **fields** » Wed 01 Sep, 2010 10:39

Raising the chlorine doesn't seem to be working. The stains are still there and don't seem to be lessening. If it is metal, what can I do about that? I did contact the re-plasterer and their idea was to drain the pool and acid wash it. I would like to avoid that process. The stains are not rough to the touch. Any other ideas?

duraleigh · Postby **duraleigh** » Wed 01 Sep, 2010 10:48

Yeah, it can be removed by doing an ascorbic acid treatment. I have not done that treatment but there are a lot of folks that have (and an article, I think) over on troublefreepool.com. metal staining is a little more involved but it can certainly be accomplished.

fields · Postby **fields** » Sat 04 Sep, 2010 19:21

Ok, I put 12 gallons of muratic in my pool. Let it sit for 24 hours, then brushed it. Stains are gone and my water is clear. Now I just have to get my PH back up. I'm trying to do that with Borax. I'll let you know how it goes. Thanks again for your help.