Plaster damage

Shaf

Member
Sep 9, 2015
5
Missouri City
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.

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Shaf

Member
Sep 9, 2015
5
Missouri City
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

Gold Supporter
TFP Guide
Jul 21, 2013
20,350
Northern NJ
How old is your plaster?

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



@onBalance thoughts?
 

Shaf

Member
Sep 9, 2015
5
Missouri City
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
 

sktn77a

Gold Supporter
May 16, 2010
1,903
Chapel Hill, NC
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.