I’m on Day 4 of SLAMming my pool. At the start of the SLAM, I adjusted my pH, as recommended, to 7.2. My CYA level is 30, so my target SLAM level is 12, which I’ve been maintaining. The pool water looks really good but I do still have some stubborn spores of mold on the plaster, and I’ve yet to pass the overnight test where my FC loss is less than 1 ppm. So, I’ll continue the process, but just wondered about my pH level being really high now. I can’t accurately test it since I’m at SLAM chlorination levels, but I’ve added so much chlorine through this process that I presume it’s quite high. Will a high ph level inhibit the chlorine’s ability to sanitize the pool, and should I be addressing that somehow? I ask because I remember the pool store staff saying this once, but wanted to verify if that’s even accurate. Thanks!
Does high pH inhibit chlorine effectiveness?
- Thread starter Sarahdeakins
- Start date
- Jul 21, 2013
- 66,526
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
pH test is unreliable with FC above 10. Just test FC and Cc during the SLAM Process
That is taken into account with the direction to lower pH to 7.2 before starting the SLAM Process
That is taken into account with the direction to lower pH to 7.2 before starting the SLAM Process
In water without CYA the pH can have a considerable effect on FC effectiveness. The presence of CYA, however, greatly reduces this effect and you can essentially treat the pH as having no effect on FC effectiveness.
So as happens quite a bit, the pool store staff is right but also completely wrong.
Don't worry about it, just keep the SLAM going.
So as happens quite a bit, the pool store staff is right but also completely wrong.
Don't worry about it, just keep the SLAM going.