Help with a nasty plaster stain...
- Thread starter Drockfresh
- Start date
Two tests: Hold a chlorine puck against the stain and see if it disappears. And grab some cheap Vitamin C tablets and try them on the stain.
If the puck works-its organic. If the Vit C works its a metal stain.
If the puck works-its organic. If the Vit C works its a metal stain.
- Mar 24, 2014
- 2,455
- Pool Size
- 32000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool SJ-55
I've got one of those too. Can't brush it off, elevated chlorine didn't do much, but it's only been a day. If it doesn't improve in a few days or so I might lay a puck on it for 15 minutes and see what that does. If that doesn't work I'm planning on diving to it when it warms up and scrubbing.
- Mar 24, 2014
- 2,455
- Pool Size
- 32000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool SJ-55
The same brush head that goes on the pole. I'm actually bored and decided to go ahead and try the puck. It looks exactly like yours and is raised, like caked mud or something.
edit: Puck got it 80%. I'm going to let time and whatever chlorine is in the pool finish, I was uncomfortable leaving it on the floor any longer.
If a puck helps then you can raise your FC up to SLAM level for your CYA and brush it a few times a day or more and it should go away in a week or two. Chlorine CYA Chart
It doesn't look like "black" algae, so I think the black stain is most likely from the rebar "rusting" below the plaster surface (gunite) and then bleeding to the surface. To fix requires chipping out the plaster and gunite down to the rebar and removing and treating properly so that it doesn't rust again. Chlorine tabs, acid, and other treatments won't stop this type of problem because it is all the way through the plaster coat.
I bet that's what it is because the pool has had other structural issues. I just rebuilt the bond beam after it crumbled into the pool. Then I had to knock out and replace the deck. spent too much on that project- you wouldn't believe it.
If there is ever money to replaster I'll take care of this. For now will have to let it be. There is no way I'm draining the pool to deal with this.
