CYA drop during SLAM

TeenaTeens · Sep 17, 2022

I’m slamming yet again as I was losing FC despite the water being crystal clean. So I did an OCLT and it failed on Tuesday night. I’m now ending day 3 of SLAM but the pool is still losing FC. Add to this so much rain at the moment - I’m going to have let some water out again. Just tested and CYA has dropped to 30. I had it at 50 a couple of weeks ago and it was 40 earlier this week before the SLAM. Do I add liquid conditioner now? Or lower my SLAM level? Help.

Mdragger88 · Sep 17, 2022

Just lower slam level- after you pass all 3 end of slam criteria you can raise cya. Remember, if cya reads inbetween two values- round up

& chlorinate accordingly

tim5055 · Sep 17, 2022

If you are absolutely sure you are at 30, use that to calculate SLAM level.

But, something is terribly wrong. To go from 50 to 30 CYA you would have had to have exchanged about 5,000 gallons of water? Do yuo have an autofill on the pool?

TeenaTeens · Sep 17, 2022

tim5055 said:
If you are absolutely sure you are at 30, use that to calculate SLAM level.

But, something is terribly wrong. To go from 50 to 30 CYA you would have had to have exchanged about 5,000 gallons of water? Do yuo have an autofill on the pool?

No I don’t. Maybe I was reading it wrong - I struggle with the CyA test as I just keep seeing the black dot. But it was between 40-50 on Wednesday and now it between 30-40. But closer to 30… So it hasn’t gone down 20 if that makes sense?

TeenaTeens · Sep 17, 2022

Mdragger88 said:
Just lower slam level- after you pass all 3 end of slam criteria you can raise cya. Remember, if cya reads inbetween two values- round up & chlorinate accordingly

Yes maybe it’s actually 40. It was between 30 - 40. Thanks. I struggle with the CYA test.

Mdragger88 · Sep 17, 2022

TeenaTeens said:
Yes maybe it’s actually 40. It was between 30 - 40. Thanks. I struggle with the CYA test.

Then go with 40 - you know you’ll be covered

SLAM ON

TeenaTeens · Sep 17, 2022

Mdragger88 said:
Then go with 40 - you know you’ll be covered
SLAM ON

Ok. It will be 30 tomorrow tho once I empty it again. Hopefully the Fc will start staying stable by then

TeenaTeens · Sep 18, 2022

TeenaTeens said:
Ok. It will be 30 tomorrow tho once I empty it again. Hopefully the Fc will start staying stable by then

Well it was still 40

slam done! Will raise it to 60 today and hopefully move on with my life.