help! stains

[xoroniox]

Ok thanks for your help, its appreciated. I think you are correct though and they are 90% all organic stains from the algae battles, most got a bit lighter with the bleach and scrubbing, however the grey stain has been there for awhile i just never bothered messing with it because its pretty small however i have had really high bleach levels even with this stain and never noticed any other stains or that stain get larger. when i scrub it, no affect. also the diamondbrite in that particular stain/area is very rough, much rougher than in all other areas of the pool, im not sure if that makes any diffrence, i will await more direction and information. thanks again. in the mean time i will continue to bleach and scrub the green stains.
-Arron

[gerri]

Ok, if you want to try the raising the chlorine level route, assuming the stains are organic, which we think they are... I read a post by Waterbear where he told another forum member to raise the Chlorine level to 30ppm and keep it there until the stains are lifted. So you can try to keep raising your chlorine level until you get it to 30ppm and keep it there a couple of days or whatever it takes.

The downside is that if you have metals you may wind up with the metal staining after your organics are gone. If you do we can deal with that by using Ascorbic Acid.

[Poolsean]

hmmmm.... gray stains are usually plaster issues, called mottling. Although this appears randomly in more than one spot in your pool. But coincidentally, the diamond brite is rough in that same area tells me that it is a plaster issue rather than a metallic or organic stain.

[xoroniox]

hm thanks for your responce, i think are you correct. however i dont remember seeing the stain 6months ago or maybe i just never noticed it, it is pretty small in either case i guess there is nothing i can do assuming it is a plaster related issue correct? besides replaster.

[Poolsean]

Don't quote me on this, but lowering the pH level may whiten it, similar to acid washing the surface.
Short of draining and acid washing the surface, there are "no drain acid wash kits".
You can also try to isolate the area and dose some acid over the area.

Since you're in South Florida, so is SGM (they're in Pompano). May be worth a call to them to see how they recommend treating it.