What temp to use for calculating CSI ?

saraiks

LifeTime Supporter
Jul 23, 2007
74
0
Fremont, CA
#1
There is a lot of variation in the day and night temperatures expected here in NorCal for this weekend. It is supposed to be at 75+ during the day and 50+ for the night. This is a 25 degree variation which produces two widely varying numbers for the CSI in the pool calculator. What number should be used to balance the pool ?
 

JasonLion

LifeTime Supporter
Platinum Supporter
TFP Expert
May 7, 2007
37,879
5
Silver Spring, MD
#2
You want to use the water temperature, which won't vary nearly as much as the air temperature. If you have both day and night water temperatures then average them.