Getting weird stain out of new plaster

djdonte

Well-known member
Mar 25, 2019
386
Houston, TX
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-30 Plus
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.
 

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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
29,065
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Put a paste of crushed up vitamin C on the stains. I think your stones are leaching iron.
 
Last edited:

djdonte

Well-known member
Mar 25, 2019
386
Houston, TX
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-30 Plus
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

TFP Expert
Mar 2, 2011
28,239
I remember from your other post, that you had some iron stains on the weirs.

Try a regular vitamin C tablet.

07C341A6-691A-4C5C-83CA-455E3871E824.jpeg
 

djdonte

Well-known member
Mar 25, 2019
386
Houston, TX
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-30 Plus
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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