Before I get too into everything

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J

Jessi

Member
Jul 22, 2019
9
NW Indiana
I was stupid last year & stopped this technique & at the end of the season my CYA was >100. I just drained a 1/3 of the water, vacuumed to siphon, refilled, put in 5L of liquid chlorine, which killed the algae that was forming. I was reading through the CYA page again today & it says to balance the pH but also that the readings could be off/unreliable when CYA & FC are off. Do I need to try to figure that out first, or should I just start the SLAM process?

TIA for your help!
 
😬 Oh, you really should have tested.

It's very possible most or all of your CYA was consumed by a bacteria and converted to ammonia. That would explain the surprise CYA level and high CC level. If your CYA was well over 100 it is possible there is a LOT of ammonia which will take a lot of chlorine, but there is a chance the bacteria had time to continue the nitrogen process and broke the ammonia down further. Won't know until you tackle that. Follow the process below before starting the SLAM Process.

Getting Rid of Ammonia in Pool Water​

  1. Dose the pool to a SLAM level of 10 ppm
  2. Do not add any CYA until chlorine begins to hold
  3. Test chlorine every 30 minutes until chlorine begins to hold. Add chlorine as needed to get back to 10 ppm. FC will likely test close to 0 until you get to the next step
  4. You will know when the chlorine begins to hold when you see FC testing > 3 ppm after 30 minutes.
  5. When you see a significant jump in FC from the prior 30-minute test CYA can be added back into the pool. Limit the CYA to 30 ppm for the duration of the process
  6. Increase the FC target to 12 ppm and follow the steps in the SLAM Process until the criteria of “Done” are all met.
  7. Follow the SLAM Process FC test procedures. You no longer need to test every 30 minutes at this stage.
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