Getting weird stain out of new plaster

djdonte · Aug 29, 2021

Quartzscape is about 3 months old. My natural stone waterfall always leaves stone "dust" on my tanning ledge, which I am pretty good about brushing off. This time I was out of town for a long weekend and when I got back, most of the dust brushed off but it seems no amount of brushing with my nylon brush will remove these stains. Any ideas? Water is balanced except for the pH which needs acid to bring it down to 7.6 from 8.2 about every 2-3 days, but I chalk that up to curing plaster.

I have an eraser and a stainless brush but I am hesitant to use it. Other organic stains like leaves and berries faded over time and even faster if I shocked. Not sure if that would work here. I'm not sure stone dust is organic.

ajw22 · Aug 29, 2021

Put a paste of crushed up vitamin C on the stains. I think your stones are leaching iron.

djdonte · Aug 29, 2021

ajw22 said:
Put a paste of crished up vitamin C on the stains. I think your stones are leaching iron.

That’s weird because it’s never done that before. I’ll try that tho. Just run of the mill vitamin C from the grocery store?

JamesW · Aug 29, 2021

I remember from your other post, that you had some iron stains on the weirs.

Try a regular vitamin C tablet.

ajw22 · Aug 29, 2021

djdonte said:
Just run of the mill vitamin C from the grocery store?

Start with that. It’s a low cost test.

djdonte · Aug 31, 2021

I'm not convinced thats iron on a 25 year old weir door. I have never had problems with iron before. In any case I tried rubbing spots with vitamin C pills and no effect. I also tried a gum eraser and a stainless brush. The brush seemed to help a tiny bit but I did not want to go crazy with it on newish plaster. Any other ideas? Here are some better pictures.

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Getting weird stain out of new plaster

djdonte

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ajw22

djdonte

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JamesW

ajw22

djdonte

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