CYA keeps rising

[Colbuster]

I slammed my pool (23 chlorine) for almost a week till it stopped losing chlorine overnight. I used liquid chlorine and I have a SWG. No tabs. Chemicals were spot on for weeks. Left out of town for last week and my SWG some how turned off (it was just flashing) and my chlorine dropped to basically zero!!! I’m so p-d off.

Got my SWG back on but now my CYA is 90! It was 55 before. Where is this CYA coming from? Now I need chlorine to be even higher. We did have a decent rain storm a couple times.

I’m at a loss. And I have a 39k gal pool so not super stoked about having to drain a significant percentage of it. Is there something I’m missing? What am I doing wrong? Been keeping ph 7.4-8.2 - shooting for 7.5 but it eats up so much acid - using gallon or more per week.

Salt is 3460, which also went up by itself over 200. I didn’t add any salt.

I feel like the pool gods hate me. Lol.

Can someone tell me what I’m doing wrong?

Thx!

 

[Colbuster]

TA is 90 ppm

 

[Bperry]

Try measuring CYA again. It can’t go up if nothing was added. So either your newest or earlier test was not accurate. So try to figure out which one of those happened.

The salt test accuracy is +\- 200ppm so don’t worry about the salt if your SWCG isn’t complaining.

Once your TA gets down to 50-60 the pH rise will slow down. So just keep after it.

 

[JJ_Tex]

Your pool math logs show just MA and Bleach added, neither would add CYA. If that is accurate, then that would either be a testing error or a mystery person adding stuff to your pool.