Plaster damage

[Shaf]

Someone threw some cal hypo into the pool (gunite/white plaster/chlorine 29k gallons) and it ate away some plaster

bad is this? I wasn’t planning on replastetring until next year. Does this change my timeline

I am generally on top of my pool chemistries.

 

[Shaf]

Also, during the initial build you could see areas that were darker, ie the gunite was showing through. I felt this was a problem but my builder assured me it was normal. For the record, white plaster should be white and opaque, and gunite should not be seen through a thin layer, right?

 

[ajw22]

How old is your plaster?

White plaster can turn gray that you may think is the gunite.

How White Pool Plaster Can Turn Gray

One would think that when mixing white cement with white limestone aggregate, the final pool plaster product would always be white. But that is not always the case. Unfortunately, white pool plaster sometimes turns gray (or grey) either immediately or a few months after the pool is filled with...

www.troublefreepool.com

Plaster Installation and Maintenance - Further Reading

www.troublefreepool.com

@onBalance thoughts?

 

[YippeeSkippy]

You sure it was Cal Hypo and not muriatic acid?

 

[Shaf]

Plaster is 6 years old

And absolutely sure as I saw them toss it in and didn't think it wouldn't dissolve, though it was on the steps

I did check all my chem levels. pH was a bit high, 7.9, TA was low at 40, everything else was within normal range. I've been having a hard time keeping TA where I need it this season

 

[ajw22]

How do you chlorinate the pool?

Please create your signature with details of your pool and equipment.

 

[sktn77a]

Unusual for a single throw of cal-hypo to burn through the plaster. It could be mild staining that was oxidized to a darker color by the chlorine. Try a little ascorbic acid on the grey discoloration.