CSI - ??

farleyville

Member
Feb 8, 2021
16
Dacula, Ga
Pool Size
19000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Aquapure 1400
Below are my latest test results... What is causing my larger negative CSI number? Trying to figure out what I need to do to keep it balanced?



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Farley Pool
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Build Type: Plaster
Volume: 19000 gallons
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Latest Test Result Summary:
FC: 4.0 (4 hours ago)
CC: 0.5 (4 hours ago)
pH: 7.7 (4 hours ago)
TA: 60 (4 hours ago)
CH: 250 (4 hours ago)
CYA: 60 (17 days ago)
SALT: 2800 (17 days ago)
TEMPERATURE: 74° (4 hours ago)
CSI: -0.44 (4 hours ago)
==========================================
 

chiefwej

LifeTime Supporter
TFP Guide
Jun 12, 2011
3,735
Tucson
Nothing really wrong with your CSI. Anything between -0.6 and +0.6 is considered acceptable. With a SWG, it’s good to maintain a negative CSI My goal for my “perfect” CSI is -0.3 to -0.03. You have low CH, and low TA, both of which feed into the CSI calculation. You can comfortably allow your pH to rise. Just keep it below 8.0.

My problem is the opposite. High TA & CH. Making it difficult to keep the CSI on the negative side.
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
23,114
Bedford, TX
F,

Looks to me like bring your TA and CH up to the middle of our recommended levels would get you to -.15..

Thanks,

Jim R.
 

Oly

Gold Supporter
Jun 28, 2017
2,339
Fresno, CA
Pool Size
27000
Play with your CSI calculation adjusting your water temp down as expeted water temps drop.