Stains On Plaster

Tile, mosaic, marbelite, Marcite, Marblesheen,
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duraleigh
Swimming Pool Wizard
Swimming Pool Wizard
Posts: 82
Joined: Sat 07 Aug, 2010 23:26
My Pool: 24X52 DIY Concrete and liner
Location: Raleigh NC

Stains On Plaster

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?


24x52 DIY concrete block and liner
1.5HP pump 925lb sand filter
http://www.tftestkits.net
fields
Pool Newbie
Pool Newbie
Posts: 8
Joined: Thu 26 Aug, 2010 08:55
My Pool: gunite pool - clorine - 13,000 gal
Location: texaS

Stains On Plaster

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
Swimming Pool Wizard
Swimming Pool Wizard
Posts: 82
Joined: Sat 07 Aug, 2010 23:26
My Pool: 24X52 DIY Concrete and liner
Location: Raleigh NC

Stains On Plaster

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.
24x52 DIY concrete block and liner
1.5HP pump 925lb sand filter
http://www.tftestkits.net
fields
Pool Newbie
Pool Newbie
Posts: 8
Joined: Thu 26 Aug, 2010 08:55
My Pool: gunite pool - clorine - 13,000 gal
Location: texaS

Stains On Plaster

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.

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