Bronze Supporter
Feb 8, 2021
Dacula, Ga
Pool Size
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?

Farley Pool
Build Type: Plaster
Volume: 19000 gallons
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)


LifeTime Supporter
TFP Guide
Jun 12, 2011
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.
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