Closing questions—water level, no cover, & high pH

May 24, 2017
20
Union, KY
Pool Size
28000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Truclear / Ei
I have a plaster pool (1 year old now) that has a sun deck of about 6-8 inches of water and a bench that wraps around most of one side of the pool. There is 9 inches between the top of the bench and the sun deck. (1) What is the best level to drain the water down to for winter closing? I know I want to drain the sun deck, but how low below that? If it gets too low, then it doesn’t leave too much water on top of the bench. Or, should I drain the water to 4 inches below the bench? How will this effect the stairs? Of course, I’m concerned about cracking during the winter freeze.

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I would like to go without covering the pool. We didn’t get a custom cover made bc we don’t like the idea of screws/attachment pieces on the side wall (plus, a pain to attach and unattach, right?) and aren’t excited about the attachment pieces that will have to be drilled into the concrete (as well as the large cost for it). Last year, we just covered it with a solar cover. It didn’t do anything to actually keep any debris out of the pool (it’s just floating on top). So, I was thinking it’d be much prettier to be able to see the pool water during the winter (I could scoop the leaves out once fall is done). I’d enjoy lighting up the pool as well during Christmas time. (2) Will the plaster get damaged by not being covered? (Especially if the sun deck +/- bench isn’t covering it with water?) Does a solar cover really do anything to help protect it?

My other pictures are of my sun deck. Just took off our pool loungers and table with umbrella, and you can see the plaster is much lighter where it was more exposed to the sun. (3) Is that expected?
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Some background: plaster pool in NKY (Cincinnati metro), poured 10/2023. Closed shortly after it was poured. Bad experience with pool construction company (the company as of 2-3 months ago no longer exists). There were tons of stains in the concrete with construction. Mid July 2024 water was drained and surface acid-washed to clear out the dirt construction stains. Then salt added (to use our SWG).

I have had pH creep all summer long. Have to add about a gallon of Muriatic acid/ week in avg with TA about 90 (80-100). Will this ever stop?? I just read about adding borates. I’ll likely do that next season—too late to do that now bc planning on closing tomorrow. I brought the pH down to 7.0 right now with a TA of 70. Aerating so maybe I can add some more and get TA down to maybe 60. (4) will there be problems if the pool go goes back up to 8.0-8.4 through the winter? I’m guess it will inevitably do that since that’s what’s been going on all summer. Do I need to do something else right now?

TIA! 🙏
 

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lol—so sorry about that random other school picture. I accidentally picked the wrong pic when uploading, but I have essentially selected the most important ones.
 
lol—so sorry about that random other school picture. I accidentally picked the wrong pic when uploading, but I have essentially selected the most important ones.
Lol - you can edit your post & delete that one.
Click the little arrow next to report at the bottom left of the post box. Then click the pic & hit the 🗑️
 
Lol - you can edit your post & delete that one.
Click the little arrow next to report at the bottom left of the post box. Then click the pic & hit the 🗑️
Thanks for those instructions—couldn’t see how to edit it earlier. I have deleted that picture. 😂

I am really hoping someone could help respond to my post. Especially about the cover and bare sun shelf question!

Would a small solar cover over the sun shelf be helpful to protect the plaster from the sun?? I guess I’d need sand bags to keep it from blowing away.
 
Exposed plaster will get rough over time. A cover keeps the sun from drying out the plaster.

A thin layer of water freezing on a plaster surface can cause spalling and break up the plaster. That is the worst water level to leave plaster in freezing conditions. Either have water below the plaster or an inch of water above the plaster.

A cover will prevent snow from falling on the plaster surface then thawing and refreezing causing spalling.

It is your pool and your choice of being able to see the pool lit up in the winter is worth the risks in not having the pool covered to protect the plaster.

pH will rise in closed pools up to where the pH and TA reach equilibrium. With a TA of 70 your pH will rise and stabilize in the high 8's. That is fine for a few months until you open the pool in the spring.


CO2_Out_of_Equilibrium.jpg
 
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