CSI too low?


Bronze Supporter
Nov 30, 2019
Pawleys Island, SC
CSI has been trending pretty low, below -.4. Actually -.51 today. My numbers have been very consistent.
Here's todays. Take a look at my logs for previous.
FC = 6.5
CC = 0
PH = 7.5
TA = 60
CH = 290
CYA = 70
SALT = 3200
TEMP = 88
CSI = -0.51
Should I be taking action to raise it? Raise PH? It's been a very consistent 7. 5 to 7.6.
Take some other action? Worry about it at all?


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
Nope. HP does not matter, only gas fired units need calcium in the water. We do recommend 200 ppm CH for fiberglass pools, helps keep them from staining. You are good there.
SWCG loves a negative CSI, less scale formation to shed during polarity reversal.

Keep your pH in the 7's. All is good.