Ph and CSI

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TeenaTeens

TeenaTeens

Bronze Supporter
Apr 25, 2022
301
Tampa FL
Pool Size
12200
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite Pro (T-15)
Can someone explain why 7.8 is the optimal Ph for getting my CSI to zero? I never go beyond the negative or positive .3 but I’m just interested why this is the case when all manufacturers suggest a must lower number. I keep mine at 7.8 until it moves higher, add MA which knocks it back to 7.6 and so on. Can anyone enlighten me?

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Adalee
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Build Type: Plaster
Volume: 12200 gallons
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Latest Test Result Summary:
FC: 5.4 (6 minutes ago)
CC: 0.0 (6 minutes ago)
pH: 7.6 (6 minutes ago)
TA: 80 (2 days ago)
CH: 360 (2 days ago)
CYA: 70 (2 days ago)
SALT: 3000 (2 days ago)
TEMPERATURE: 85° (6 minutes ago)
CSI: -0.14 (6 minutes ago)
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First & foremost your test numbers above are outstanding. Remember that worrying about CSI is not generally required for most pool owners unless they live in an areas prone to extremely hard water. If your overall chemistry is good, everything is fine. But understanding CSI as a tool is certainly a good thing. So, CSI is comprised of 4 things: water temp, pH, TA, and CH. Each of these fluctuate from pool to pool, so your ideal TA or pH may be totally different from your neighbor. Some pools have a pH that settles around 7.8, especially salt pools. Trying to force the pH any lower is not only futile but not needed if the other 3 parameters are managed well. A slightly negative CSI, like you have right now, helps to prevent scale on the pool and SWG cell plates. Keep in mind generic levels recommendations from manufactures don't take into account the wide variety of pool and equipment scenarios that we do here at TFP which is why we have several different recommended levels based on pool type and chlorination method.
 
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