Managing CSI in Cold Water

Uncle Flappy · Dec 13, 2017

All,

Old Man Winter is in the desert southwest and my pool is a bone-chilling 49 degrees. The SWCG is off and I am using liquid chlorine. Here are my numbers:

FC: 8
CC: 0
pH: 7.7
TA: 70
CH: 375
CYA: 80
Salt: 3500
Borates: 50

That brings my CSI to -0.59 and "Potential to become corrosive to plaster".

How do you all balance your water in lower temps?

Thanks!

- Flappy

mknauss · Dec 13, 2017

Let your pH ride up to 8 and your TA will increase as you are still adding some fill water due to evaporation. That and the fact the water is so cold everything goes slower.

Good to keep an eye on it.

Take care.

Uncle Flappy · Dec 13, 2017

Sounds like a plan. Thanks for your help.

Justlearning · Dec 13, 2017

This was going to be a new post for me as well as my water is 45 in Atlanta Georgia area. Is there any issues with letting the ph stay in the 8.0 range all winter?
Any reason to chase CSI with the other variables (CH or TA)
Thanks in advance
TJ

mknauss · Dec 13, 2017

It is not good to let the pH rise to above 8.0. It is best to keep it in the 7's.

The OP is located in Arizona and has high CH and TA fill water. So it is best to not add calcium or baking soda as the fill water pushes those parameters up. And we have little rain and constant evaporation.

Uncle Flappy · Dec 14, 2017

mknauss said:
It is not good to let the pH rise to above 8.0. It is best to keep it in the 7's.

The OP is located in Arizona and has high CH and TA fill water. So it is best to not add calcium or baking soda as the fill water pushes those parameters up. And we have little rain and constant evaporation.

My well water is very different than the city stuff. It has a TA of 100 and CH of only 75. I added some baking soda to the pool and will check it tomorrow to ensure the water is better balanced.

Thanks again for your help.

- Flappy

mknauss · Dec 14, 2017

Uncle Flappy said:
My well water is very different than the city stuff. It has a TA of 100 and CH of only 75. I added some baking soda to the pool and will check it tomorrow to ensure the water is better balanced.

Thanks again for your help.

- Flappy

With that, then you need to maintain your chemistry differently than all of us that use Colorado River water.

Take care.