Whole Pool Stain, Rough Plaster at Season Open

[MaryS]

Would the "Jack's Magic" product be safe on dark plaster?

[mbar]

I am not sure, I would check with Jack's Magic - they have a great customer support staff.

[Lenny]

Anyone have an idea how low you should drop the PH before trying to physically remove scale?

[pairadocs]

Anyone have an idea how low you should drop the PH before trying to physically remove scale?

I'd love to know the same thing? I've heard 6.8 - 7.0 pH for scale brushing.

Bob

ps. Lenny, we're neighbours. I'm in Newark, DE

[steveinaz]

I have this same odd staining. It doesn't react to any of Magic Jacks metal testing, chorine does nothing to it, nor does vitamin C. It looks like light dirt staining or something. I even tried my stainless brush---NOTHING, stain doesn't move.

Which Magic Jack's product are you guys using?

[waterbear]

I have this same odd staining. It doesn't react to any of Magic Jacks metal testing, chorine does nothing to it, nor does vitamin C. It looks like light dirt staining or something. I even tried my stainless brush---NOTHING, stain doesn't move.

Which Magic Jack's product are you guys using?

Scale will not respond to sequestration or to vitamin c. It responds to acid washing and sandblasting.
The Jack's magic stain and scale stuff is, essentially, a no drain acid wash and requires that the heater be isolated and the pool closed for several weeks while it works. since it drops the pH quite low. if it is in isolates areas you can try a pumice stone. If on the waterline or tile you can drop the water a bit and try muriatic acid.